thetan.

Brit.

/ˈθiːtə/, U.S.

/ˈθeɪdə/,

/ˈθidə/

Etymology: < Greek θῆτα: see definition.

a. The eighth letter of the Greek alphabet, Θ, θ (see th n.¹). In ancient Greece, on the ballots used in voting upon a sentence of life or death, θ stood for θάνατος, death; hence in allusive use.

ΘΚΠ

society > communication > writing > written character > name of written character > [noun] > Greek

alphac1175

muc1175

betaa1400

taua1400

chic1400

deltac1400

etac1400

kappac1400

gamma?a1425

lambda?a1425

nu?a1425

phi?a1425

pi?a1425

psi?a1425

rho?a1425

xi?a1425

zeta?a1425

upsilon1559

san1584

omega1599

theta1603

iota1607

sigma1607

omicron1631

digamma1699

epsilon1842

zeta1850

the mind > attention and judgement > contempt > disapproval > dispraise or discommendation > [noun] > censure or condemnation > mark of

black coal1525

theta1603

note1605

black mark1624

demerit mark1862

strike1938

1603 S. Daniel Def. Ryme in Panegyrike (new ed.) sig. H4 Setting his Theta or marke of condemnation vppon them.

1616–61 B. Holyday tr. Persius Sat. iv. 317 And the black theta, signe of deadly shame, Thou can'st prefix 'fore an offenders name.

a1682 Sir T. Browne Christian Morals (1716) i. 23 At the Tribunal of our selves, wherein iniquities have their natural Theta's, and no nocent is absolved by the verdict of himself.

1789 M. Madan tr. Persius Satires (1795) 103 Able to fix the black theta to vice.

b. attributive and in other combinations, as theta-sounding adj.; theta-function n. in Mathematics, a name for two different functions: (a) the sum of a series from n = − ∞ to n = + ∞ of terms denoted by exp(n²a + 2na); also extended to a similar function of several variables; (b) a function occurring in probabilities, expressed by the integral ∫exp(-t²)dt. theta-phi diagram n. the temperature-entropy diagram, which represents the heat-units converted into work per pound of working fluid (θ = absolute temperature, and ϕ = entropy).

ΘΚΠ

the world > relative properties > number > algebra > [noun] > expression > function

function1758

exponential1784

potential function1828

syzygy1850

permutant1852

Green function1863

theta-function1871

Greenian1876

Gudermannian1876

discriminoid1877

Weierstrassian function1878

gradient1887

beta function1888

distribution function1889

Riemann zeta function1899

Airy integral1903

Poisson bracket1904

Stirling approximation1908

functional1915

metric1921

Fourier transform1923

recursive function1934

utility function1934

Airy function1939

transfer function1948

objective function1949

restriction1949

multifunction1954

restriction mapping1956

scalar function1956

Langevin function1960

mass function1961

the world > matter > physics > mechanics > dynamics > thermodynamics > [noun] > entropy > specific diagram

theta-phi diagram1901

1871 M. Collins Marquis & Merchant III. iii. 88 You [English] are a theta-sounding people.

1879 A. Cayley Coll. Math. Papers X. 475 We have thus an addition-with-subtraction theorem for the double theta-functions.

1901 Pract. Engineer Pocket Bk. 166 The temperature-entropy diagram is usually called the θϕ (theta-phi) diagram.

2. Biology. Used to designate rhythmic activity of the brain recorded by an electroencephalograph and having a frequency of between four and seven cycles per second.

ΘΚΠ

the world > life > biology > biological processes > action of nervous system > [noun] > electrical phenomena

neuroelectricity1914

rheobase1917

bioelectricity1925

monophasicity1932

Berger rhythm1934

skin potential1934

brain wave1935

beta rhythm1936

beta waves1936

theta1944

hyperpolarization1946

hyperpolarizing1950

conductance1966

biopower1978

1944 W. G. Walter & F. J. Dovey in Jrnl. Neurol., Neurosurg. & Psychiatry VII. 64/1 In the case of the 4–7 c/s. waves the term we suggest is ‘theta’.

1944 W. G. Walter & F. J. Dovey in Jrnl. Neurol., Neurosurg. & Psychiatry 7 65/1 It is suggested that rhythms at about 6 c/s. should be termed ‘theta’ rhythms and that such rhythms are characteristic of the resting, immature or isolated parieto-temporal complex.

1953 Brit. Jrnl. Psychol. 44 320 The excessive theta rhythm..found in some aggressive psychopaths.

1961 Lancet 26 Aug. 465/1 An E.E.G. recorded when fasting showed some abnormality, with rhythmic 6 c.p.s. theta activity in the resting tracing.

1972 Sci. Amer. Feb. 85/3 Subjects with a great deal of experience in meditation showed other changes: the alpha waves slowed..and rhythmical theta waves at six to seven cycles per second appeared.

1975 J. Taylor Superminds vii. 121 In states of extreme emotion, theta waves of four to seven cycles and up to thirty microvolts occur.

3. In Scientology: creative energy or spirit (see quot. 1965). See also thetan n. at Derivatives.

ΘΚΠ

society > faith > aspects of faith > spirituality > soul > [noun] > in Scientology

theta1951

1951 L. R. Hubbard Handbk. for Preclears 77/1 Theta. The mathematical symbol for the static of thought. By theta is meant the static itself.

1957 J. F. Horner Summary of Scientol. iv. 56 In Scientology, the specialized term, ‘theta’, is used to refer to thought and spirit. The term, ‘Thetan’, refers to the single unit of beingness which each person is.

1965 L. R. Hubbard Scientol. Abridged Dict. 33 Theta, energy peculiar to life or a thetan which acts upon material in the physical universe.

1977 C. McFadden Serial (1978) xxvii. 60/2 Marlene said Theta taught you how to overcome Specific Negatives.

4. Chemistry. theta (or θ, Θ) temperature, the temperature of a polymer solution at which it behaves ideally as regards its osmotic pressure; so theta condition, theta solvent, etc.

ΘΚΠ

the world > matter > chemistry > physical chemistry > solvents and solutes > [noun]

protophile1930

theta solvent1953

the world > matter > chemistry > polymer chemistry > polymers (assoc. miscellaneous) > [noun] > theta temperature

theta (or θ, Θ) temperature1953

1953 P. J. Flory Princ. Polymer Chem. xii. 523 Frequently it is preferred to use as a parameter the ‘ideal’ temperature Θ... At the temperature T = Θ, the chemical potential due to segment-solvent interactions is zero... Hence the temperature Θ is that at which the excess chemical potential is zero and deviations from ideality vanish.

1953 P. J. Flory Princ. Polymer Chem. xiv. 612 An ideal solvent, or Θ-solvent.

1953 P. J. Flory Princ. Polymer Chem. xiv. 612 The intrinsic viscosity usually changes rapidly with temperature in the vicinity of the Θ-point.

1966 Brandrup & Immergut Polymer Handbk. iv. 163 Theta-solvents (θ-solvents) are solvents in which, at a given temperature, a polymer molecule is in the so-called theta-state, where it behaves like an ideal statistical coil.

1973 J. M. G. Cowie Polymers vii. 138 Above the theta temperature expansion of the coil takes place, caused by interactions with the solvent, whereas below Θ the polymer segments attract one another, the excluded volume is negative, and eventual phase separation occurs.

1974 Sci. Amer. Dec. 60/2 At that temperature, which varies for different polymers and solvents, the measured properties of the polymer can be usefully compared with those of other polymers at their theta temperature.

5. Particle Physics. Frequently written θ. A meson that decays into two pions, now identified with the kaon. Also theta meson.

ΘΚΠ

the world > matter > physics > atomic physics > particle physics > particle participating in strong interaction > meson > [noun] > type of

tau1949

photomeson1950

theta1954

eta1961

omega meson1961

rho1961

phi meson1962

bottomonium1976

quarkonium1977

upsilon1977

1954 Physical Rev. 94 1732/1 A large fraction of these V⁰ decays are consistent with the decay scheme θ⁰→π^± + π^± (or μ^∓).

1955 Proc. Glasgow Conf. Nucl. & Meson Physics 1954 347 The striking similarity of the masses of the θ⁰ and τ± mesons.

6. theta pinch n. [θ, the symbol of the angle of the radius vector of the circular path of the current.] Nuclear Physics a toroidal pinch (pinch n. 5) in which the magnetic field follows the axis of the plasma and the current-carrying coils encircle it.

ΘΚΠ

the world > matter > physics > atomic nucleus > nuclear fission > nuclear fusion > [noun] > fusion reactor > toroidal pinch

theta pinch1959

1959 Nucleonics Oct. 82/2 The conference topic that aroused greatest interest was the theta pinch.

1967 New Scientist 9 Nov. 369/1 The simplicity of the theta pinch as a means of achieving that sought after goal of power from thermonuclear reactions had led to considerable studies of its real effectiveness in confining and heating up a plasma.

1974 Nature 20 Sept. 193/2 In the theta-pinch design, the compression coils are not superconducting and no special measures are taken to reduce neutron heating.

Derivatives

ˈthetan n. in Scientology, the embodiment of the creative spirit in the individual (see sense 3).

ΘΚΠ

society > faith > aspects of faith > spirituality > soul > [noun] > in Scientology > embodiment in individual

thetan1952

1952 L. R. Hubbard Scientol.: 8–80 83 The thetan, or theta being, takes over a body only a few days or a week before birth.

1965 L. R. Hubbard Scientol. Abridged Dict. 33 Thetan, the person himself..; that which is aware of being aware; the identity that is the individual.

1971 J. G. Foster Enquiry into Pract. & Effects Scientol. iv. 42 in Parl. Papers 1971–2 XXXVI. 917 Scientology departs from the mechanistic psychology of Dianetics by introducing a new causative agent... More usually..and especially in recent works..it is called the ‘spirit’ or ‘thetan’... Among the goals of Scientology processing are to increase the beingness of the thetan and thus increase the creative potential of the individual personality and its analytical mind.

1977 Times Lit. Suppl. 13 May 582/5 The gnosis centres on the ‘thetan’, the true self... The core task of the cult ought to be to cleanse and return the thetan to its immortal, pristine, form.

This entry has not yet been fully updated (first published 1912; most recently modified version published online March 2022).

单词	theta
释义	thetan. Brit. /ˈθiːtə/, U.S. /ˈθeɪdə/, /ˈθidə/ Etymology: < Greek θῆτα: see definition. 1. a. The eighth letter of the Greek alphabet, Θ, θ (see th n.¹). In ancient Greece, on the ballots used in voting upon a sentence of life or death, θ stood for θάνατος, death; hence in allusive use. ΘΚΠ society > communication > writing > written character > name of written character > [noun] > Greek alphac1175 muc1175 betaa1400 taua1400 chic1400 deltac1400 etac1400 kappac1400 gamma?a1425 lambda?a1425 nu?a1425 phi?a1425 pi?a1425 psi?a1425 rho?a1425 xi?a1425 zeta?a1425 upsilon1559 san1584 omega1599 theta1603 iota1607 sigma1607 omicron1631 digamma1699 epsilon1842 zeta1850 the mind > attention and judgement > contempt > disapproval > dispraise or discommendation > [noun] > censure or condemnation > mark of black coal1525 theta1603 note1605 black mark1624 demerit mark1862 strike1938 1603 S. Daniel Def. Ryme in Panegyrike (new ed.) sig. H4 Setting his Theta or marke of condemnation vppon them. 1616–61 B. Holyday tr. Persius Sat. iv. 317 And the black theta, signe of deadly shame, Thou can'st prefix 'fore an offenders name. a1682 Sir T. Browne Christian Morals (1716) i. 23 At the Tribunal of our selves, wherein iniquities have their natural Theta's, and no nocent is absolved by the verdict of himself. 1789 M. Madan tr. Persius Satires (1795) 103 Able to fix the black theta to vice. b. attributive and in other combinations, as theta-sounding adj.; theta-function n. in Mathematics, a name for two different functions: (a) the sum of a series from n = − ∞ to n = + ∞ of terms denoted by exp(n²a + 2na); also extended to a similar function of several variables; (b) a function occurring in probabilities, expressed by the integral ∫exp(-t²)dt. theta-phi diagram n. the temperature-entropy diagram, which represents the heat-units converted into work per pound of working fluid (θ = absolute temperature, and ϕ = entropy). ΘΚΠ the world > relative properties > number > algebra > [noun] > expression > function function1758 exponential1784 potential function1828 syzygy1850 permutant1852 Green function1863 theta-function1871 Greenian1876 Gudermannian1876 discriminoid1877 Weierstrassian function1878 gradient1887 beta function1888 distribution function1889 Riemann zeta function1899 Airy integral1903 Poisson bracket1904 Stirling approximation1908 functional1915 metric1921 Fourier transform1923 recursive function1934 utility function1934 Airy function1939 transfer function1948 objective function1949 restriction1949 multifunction1954 restriction mapping1956 scalar function1956 Langevin function1960 mass function1961 the world > matter > physics > mechanics > dynamics > thermodynamics > [noun] > entropy > specific diagram theta-phi diagram1901 1871 M. Collins Marquis & Merchant III. iii. 88 You [English] are a theta-sounding people. 1879 A. Cayley Coll. Math. Papers X. 475 We have thus an addition-with-subtraction theorem for the double theta-functions. 1901 Pract. Engineer Pocket Bk. 166 The temperature-entropy diagram is usually called the θϕ (theta-phi) diagram. 2. Biology. Used to designate rhythmic activity of the brain recorded by an electroencephalograph and having a frequency of between four and seven cycles per second. ΘΚΠ the world > life > biology > biological processes > action of nervous system > [noun] > electrical phenomena neuroelectricity1914 rheobase1917 bioelectricity1925 monophasicity1932 Berger rhythm1934 skin potential1934 brain wave1935 beta rhythm1936 beta waves1936 theta1944 hyperpolarization1946 hyperpolarizing1950 conductance1966 biopower1978 1944 W. G. Walter & F. J. Dovey in Jrnl. Neurol., Neurosurg. & Psychiatry VII. 64/1 In the case of the 4–7 c/s. waves the term we suggest is ‘theta’. 1944 W. G. Walter & F. J. Dovey in Jrnl. Neurol., Neurosurg. & Psychiatry 7 65/1 It is suggested that rhythms at about 6 c/s. should be termed ‘theta’ rhythms and that such rhythms are characteristic of the resting, immature or isolated parieto-temporal complex. 1953 Brit. Jrnl. Psychol. 44 320 The excessive theta rhythm..found in some aggressive psychopaths. 1961 Lancet 26 Aug. 465/1 An E.E.G. recorded when fasting showed some abnormality, with rhythmic 6 c.p.s. theta activity in the resting tracing. 1972 Sci. Amer. Feb. 85/3 Subjects with a great deal of experience in meditation showed other changes: the alpha waves slowed..and rhythmical theta waves at six to seven cycles per second appeared. 1975 J. Taylor Superminds vii. 121 In states of extreme emotion, theta waves of four to seven cycles and up to thirty microvolts occur. 3. In Scientology: creative energy or spirit (see quot. 1965). See also thetan n. at Derivatives. ΘΚΠ society > faith > aspects of faith > spirituality > soul > [noun] > in Scientology theta1951 1951 L. R. Hubbard Handbk. for Preclears 77/1 Theta. The mathematical symbol for the static of thought. By theta is meant the static itself. 1957 J. F. Horner Summary of Scientol. iv. 56 In Scientology, the specialized term, ‘theta’, is used to refer to thought and spirit. The term, ‘Thetan’, refers to the single unit of beingness which each person is. 1965 L. R. Hubbard Scientol. Abridged Dict. 33 Theta, energy peculiar to life or a thetan which acts upon material in the physical universe. 1977 C. McFadden Serial (1978) xxvii. 60/2 Marlene said Theta taught you how to overcome Specific Negatives. 4. Chemistry. theta (or θ, Θ) temperature, the temperature of a polymer solution at which it behaves ideally as regards its osmotic pressure; so theta condition, theta solvent, etc. ΘΚΠ the world > matter > chemistry > physical chemistry > solvents and solutes > [noun] protophile1930 theta solvent1953 the world > matter > chemistry > polymer chemistry > polymers (assoc. miscellaneous) > [noun] > theta temperature theta (or θ, Θ) temperature1953 1953 P. J. Flory Princ. Polymer Chem. xii. 523 Frequently it is preferred to use as a parameter the ‘ideal’ temperature Θ... At the temperature T = Θ, the chemical potential due to segment-solvent interactions is zero... Hence the temperature Θ is that at which the excess chemical potential is zero and deviations from ideality vanish. 1953 P. J. Flory Princ. Polymer Chem. xiv. 612 An ideal solvent, or Θ-solvent. 1953 P. J. Flory Princ. Polymer Chem. xiv. 612 The intrinsic viscosity usually changes rapidly with temperature in the vicinity of the Θ-point. 1966 Brandrup & Immergut Polymer Handbk. iv. 163 Theta-solvents (θ-solvents) are solvents in which, at a given temperature, a polymer molecule is in the so-called theta-state, where it behaves like an ideal statistical coil. 1973 J. M. G. Cowie Polymers vii. 138 Above the theta temperature expansion of the coil takes place, caused by interactions with the solvent, whereas below Θ the polymer segments attract one another, the excluded volume is negative, and eventual phase separation occurs. 1974 Sci. Amer. Dec. 60/2 At that temperature, which varies for different polymers and solvents, the measured properties of the polymer can be usefully compared with those of other polymers at their theta temperature. 5. Particle Physics. Frequently written θ. A meson that decays into two pions, now identified with the kaon. Also theta meson. ΘΚΠ the world > matter > physics > atomic physics > particle physics > particle participating in strong interaction > meson > [noun] > type of tau1949 photomeson1950 theta1954 eta1961 omega meson1961 rho1961 phi meson1962 bottomonium1976 quarkonium1977 upsilon1977 1954 Physical Rev. 94 1732/1 A large fraction of these V⁰ decays are consistent with the decay scheme θ⁰→π^± + π^± (or μ^∓). 1955 Proc. Glasgow Conf. Nucl. & Meson Physics 1954 347 The striking similarity of the masses of the θ⁰ and τ± mesons. 6. theta pinch n. [θ, the symbol of the angle of the radius vector of the circular path of the current.] Nuclear Physics a toroidal pinch (pinch n. 5) in which the magnetic field follows the axis of the plasma and the current-carrying coils encircle it. ΘΚΠ the world > matter > physics > atomic nucleus > nuclear fission > nuclear fusion > [noun] > fusion reactor > toroidal pinch theta pinch1959 1959 Nucleonics Oct. 82/2 The conference topic that aroused greatest interest was the theta pinch. 1967 New Scientist 9 Nov. 369/1 The simplicity of the theta pinch as a means of achieving that sought after goal of power from thermonuclear reactions had led to considerable studies of its real effectiveness in confining and heating up a plasma. 1974 Nature 20 Sept. 193/2 In the theta-pinch design, the compression coils are not superconducting and no special measures are taken to reduce neutron heating. Derivatives ˈthetan n. in Scientology, the embodiment of the creative spirit in the individual (see sense 3). ΘΚΠ society > faith > aspects of faith > spirituality > soul > [noun] > in Scientology > embodiment in individual thetan1952 1952 L. R. Hubbard Scientol.: 8–80 83 The thetan, or theta being, takes over a body only a few days or a week before birth. 1965 L. R. Hubbard Scientol. Abridged Dict. 33 Thetan, the person himself..; that which is aware of being aware; the identity that is the individual. 1971 J. G. Foster Enquiry into Pract. & Effects Scientol. iv. 42 in Parl. Papers 1971–2 XXXVI. 917 Scientology departs from the mechanistic psychology of Dianetics by introducing a new causative agent... More usually..and especially in recent works..it is called the ‘spirit’ or ‘thetan’... Among the goals of Scientology processing are to increase the beingness of the thetan and thus increase the creative potential of the individual personality and its analytical mind. 1977 Times Lit. Suppl. 13 May 582/5 The gnosis centres on the ‘thetan’, the true self... The core task of the cult ought to be to cleanse and return the thetan to its immortal, pristine, form. This entry has not yet been fully updated (first published 1912; most recently modified version published online March 2022). < n.1603
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