luminosityn.

Brit.

/ˌluːmᵻˈnɒsᵻti/,

/ˌljuːmᵻˈnɒsᵻti/, U.S.

/ˌluməˈnɑsədi/

Etymology: < luminous adj.: see -ity suffix, -osity suffix.

a. The quality or condition of being luminous.

ΘΚΠ

the world > matter > light > [noun] > shining or being luminous

shininga1300

lighteninga1382

lucencec1485

overshining1587

emication1633

luminosity1634

outshining1648

luminousness1668

fulsion1680

affulsion1730

raying1787

lumination1794

nebulosity1813

lustrousness1839

luminance1880

the mind > mental capacity > intelligibility > clearness, lucidity > [noun]

shireness?c1225

plainnessc1475

distinction1589

dilucidity1603

clarity1616

plain English1645

unmistakableness1665

distinctness1668

lucidness1836

unambiguity1842

lucidity1851

luminosity1865

luminousness1873

non-ambiguity1933

drover's dog1983

the world > animals > animal body > general parts > [noun] > organ emitting light > characteristic of emitting light

self-luminosity1841

luminosity1871

1634 Bp. J. Hall Contempl. Hist. New Test. (STC 12640.5) 140 As it is in the sun..the luminosity of it being no whit impayred by that perpetuall emission of lightsome beames.

1849 R. Owen in J. F. W. Herschel Man. Sci. Enq. (Lords Commissioners Admiralty) 350 The phenomena of oceanic luminosity.

1865 E. C. Clayton Cruel Fortune II. 148 To impart additional luminosity to your ideas.

1871 C. Darwin Descent of Man I. x. 345 The purpose of the luminosity in the female glowworm is..not understood.

1895 I. Zangwill Master ii. i. 120 Luminosity of colour, richness of handling, grip of composition.

b. The effectiveness of light of any particular wavelength in producing the sensation of brightness when perceived.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > light > intensity of light, luminosity > [noun]

brightness1674

self-luminosity1841

illumination1863

luminosity1898

illuminance1943

luminance1950

irradiance1956

1888 Amer. Jrnl. Sci. 136 359 While..the luminosity of any spectral ray increases proportionately to the heat in this ray, and indeed is but another manifestation of the same energy..there is..a failure to recognize how totally different optical effects may be produced..according to the wave-length.]

1898 Astrophysical Jrnl. 7 303 That particular property of any color which determines its value as an illuminant is called its ‘luminosity’.

1936 Proc. Royal Soc. A. 155 664 The relative luminosity (visibility) in the red region has been measured..as far as 770 mμ. In this paper an account is given of measurements up to 900 mμ. At this wavelength the relative luminosity is one-sixty millionth of that at 556 mμ.

1950 F. H. Adler Physiol. Eye xx. 645 The luminosity of any one wave length is usually compared to that of 550 mμ.

1966 C. W. Wilman Seeing & Perceiving xiv. 116 Curve Ph in Fig. 78 represents the relative luminosity (brightness) of various parts of the spectrum.

c. Astronomy. The intrinsic brightness of a heavenly body (as distinct from its apparent brightness, diminished by distance); the rate of emission of electromagnetic radiation (visible or invisible) within any part of the spectrum.

ΘΚΠ

the world > the universe > star > star-matter > [noun] > brightness

brightness1674

absolute brightness1832

sun power1853

luminosity1906

the world > matter > light > naturally occurring light > [noun] > starlight > brightness of

luminosity1906

the world > matter > physics > electromagnetic radiation > [noun] > rate of emission of

luminosity1974

the world > matter > physics > electromagnetic radiation > light > intensity of light, luminosity > [noun] > rate, ratio

transmittance1919

square law1921

luminosity1974

1906 Astrophysical Jrnl. 33 248 Prevailing opinion.. admits the presence in the heavens of at least a few stars of extraordinary intrinsic brilliancy…stars having a luminosity exceeding that of the Sun by ten-thousand fold or more.

1924 H. Dingle Mod. Astrophysics vi. 74 By brightness we mean—at present, at any rate—the apparent brightness of a star, which will be determined by the star's distance from us as well as by its intrinsic luminosity.

1930 R. H. Baker Astron. ix. 369 The apparent magnitude of a star relates to its brightness as we observe it, depending on its real brightness, or luminosity, and on its distance.

1974 Nature 1 Mar. 34/2 We have..assumed a thermal spectrum, with an electron temperature of 2 × 10⁶ K, in deriving an upper limit to the X-ray luminosity of the source.

1974 Nature 1 Mar. 34/2 A 3σ upper limit was obtained to the source luminosity of 4·0 (±1·0) × 10³² erg s⁻¹ for the energy range 0·5 to 1·5 keV.

2. Something luminous; a luminous point or area.

ΘΚΠ

the world > matter > light > [noun] > shining or being luminous > something luminous

shiner1398

lustre1743

nebulosity1762

luminosity1853

1853 E. K. Kane U.S. Grinnell Exped. xxvii. 223 I thought I saw a luminosity overhead.

1873 R. Browning Red Cotton Night-cap Country iv. 232 Then his face grew one luminosity.

1895 I. Zangwill Master ii. ii. 142 The strange warm luminosities Matt professed to see on London tiles.

Compounds

Special combinations:

luminosity curve n. a graph showing how emitted energy, or perceived brightness, varies with wavelength.

ΘΚΠ

the world > relative properties > number > graph or diagram > [noun] > graph > showing specific relationship

characteristic1881

characteristic curve1881

time curve1883

luminosity curve1886

hysteresis curve1890

hysteresis loop1892

time-distance1892

solidus1901

power curve1908

log log1910

Russell diagram1922

creep curve1931

power curve1932

Hertzsprung–Russell diagram1939

Petersen graph1947

utility curve1948

tournament graph1959

offset1987

1886 Abney & Festing in Philos. Trans. (Royal Soc.) 177 425 By successive alterations in the distance of the comparison-light other pairs of points in the spectrum are determined until the limits of the visible spectrum are reached. The curves of intensities of different parts of the spectrum plotted from these observations will be found to be fairly smooth. This curve we call the ‘luminosity curve’.

1886 Abney & Festing in Philos. Trans. (Royal Soc.) 177 452 We..determined the luminosity-curve of a candle.

1900 Astrophysical Jrnl. 11 220 (heading) Determining the luminosity curve of the solar spectrum.

1937 Nature 6 Mar. 409/2 The maximum of this luminosity curve was at 510 mμ. This was a mean value for forty-eight young observers.

1941 J. D. Cobine Gaseous Conductors xiii. 514 The luminosity curve for an incandescent lamp is shifted slightly toward the long wave lengths compared with sunlight.

1951 Proc. IRE 39 1143/2 The luminosity curve expresses the relation..between the luminance and the radiance of spectrum colors.

1951 Proc. IRE 39 1144/1 Based on the new definition of the lumen, and on the new International Temperature Scale, the peak value of the luminosity curve corresponds to 680 lumens per watt.

luminosity function n. Astronomy a function giving the number or proportion of heavenly bodies with an absolute magnitude equal to, or greater than, any chosen value.

ΘΚΠ

the world > the universe > cosmology > science of observation > astronomical calculation > [noun] > part

argumentc1405

astronomicalsa1690

element1788

parameter1829

perturbative function1856

luminosity function1924

Hubble constant1933

Oort constant1941

1924 Astrophysical Jrnl. 59 13 The comparison..is easily made with the aid of what may be called the apparent luminosity function..which expresses the frequencies of absolute magnitudes among the stars brighter than m₀.

1958 Astrophysical Jrnl.: Suppl. Ser. 3 211 Distances of galaxies are correlated with their apparent magnitude; however the uncertainty of the luminosity function of galaxies complicates and weakens the statistical treatment.

Draft additions 1997

d. Particle Physics. A parameter of a colliding-beam accelerator, equal to the ratio of the rate of interactions to the reaction cross-section, and proportional to the product of the rates of arrival of particles in the two beams divided by the cross-sectional area of the intersecting region.

ΘΚΠ

the world > matter > physics > atomic physics > particle physics > particle accelerator > [noun] > types of > collider > parameter of

luminosity1964

1964 F. Amman et al. in Proc. Internat. Conf. High Energy Accelerators 1963 250/2 The interaction rate per beam crossing region, ṅ for an event whose cross section is σ..is given by: ṅ=..=Lσ (events/sec)..; the quantity L, measured in cm⁻².s⁻¹ or cm⁻².h⁻¹, includes all the ring parameters and is called luminosity.

1976 Physics Bull. Apr. 159/2 In general, colliding beam devices suffer in comparison with accelerators and conventional solid targets from a relatively low beam-beam interaction rate (or ‘luminosity’) at the intersection.

1980 Nature 7 Feb. 515/2 As the luminosity of storage rings increases rapidly with energy, it is hoped to raise the present 50 per day event rate by a factor of ten.

1985 Sci. Amer. June 64/2 The luminosity of each beam of the SSC is to be 10³³ per second per square centimeter.

This entry has not yet been fully updated (first published 1903; most recently modified version published online March 2022).

单词	luminosity
释义	luminosityn. Brit. /ˌluːmᵻˈnɒsᵻti/, /ˌljuːmᵻˈnɒsᵻti/, U.S. /ˌluməˈnɑsədi/ Etymology: < luminous adj.: see -ity suffix, -osity suffix. 1. a. The quality or condition of being luminous. ΘΚΠ the world > matter > light > [noun] > shining or being luminous shininga1300 lighteninga1382 lucencec1485 overshining1587 emication1633 luminosity1634 outshining1648 luminousness1668 fulsion1680 affulsion1730 raying1787 lumination1794 nebulosity1813 lustrousness1839 luminance1880 the mind > mental capacity > intelligibility > clearness, lucidity > [noun] shireness?c1225 plainnessc1475 distinction1589 dilucidity1603 clarity1616 plain English1645 unmistakableness1665 distinctness1668 lucidness1836 unambiguity1842 lucidity1851 luminosity1865 luminousness1873 non-ambiguity1933 drover's dog1983 the world > animals > animal body > general parts > [noun] > organ emitting light > characteristic of emitting light self-luminosity1841 luminosity1871 1634 Bp. J. Hall Contempl. Hist. New Test. (STC 12640.5) 140 As it is in the sun..the luminosity of it being no whit impayred by that perpetuall emission of lightsome beames. 1849 R. Owen in J. F. W. Herschel Man. Sci. Enq. (Lords Commissioners Admiralty) 350 The phenomena of oceanic luminosity. 1865 E. C. Clayton Cruel Fortune II. 148 To impart additional luminosity to your ideas. 1871 C. Darwin Descent of Man I. x. 345 The purpose of the luminosity in the female glowworm is..not understood. 1895 I. Zangwill Master ii. i. 120 Luminosity of colour, richness of handling, grip of composition. b. The effectiveness of light of any particular wavelength in producing the sensation of brightness when perceived. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > intensity of light, luminosity > [noun] brightness1674 self-luminosity1841 illumination1863 luminosity1898 illuminance1943 luminance1950 irradiance1956 1888 Amer. Jrnl. Sci. 136 359 While..the luminosity of any spectral ray increases proportionately to the heat in this ray, and indeed is but another manifestation of the same energy..there is..a failure to recognize how totally different optical effects may be produced..according to the wave-length.] 1898 Astrophysical Jrnl. 7 303 That particular property of any color which determines its value as an illuminant is called its ‘luminosity’. 1936 Proc. Royal Soc. A. 155 664 The relative luminosity (visibility) in the red region has been measured..as far as 770 mμ. In this paper an account is given of measurements up to 900 mμ. At this wavelength the relative luminosity is one-sixty millionth of that at 556 mμ. 1950 F. H. Adler Physiol. Eye xx. 645 The luminosity of any one wave length is usually compared to that of 550 mμ. 1966 C. W. Wilman Seeing & Perceiving xiv. 116 Curve Ph in Fig. 78 represents the relative luminosity (brightness) of various parts of the spectrum. c. Astronomy. The intrinsic brightness of a heavenly body (as distinct from its apparent brightness, diminished by distance); the rate of emission of electromagnetic radiation (visible or invisible) within any part of the spectrum. ΘΚΠ the world > the universe > star > star-matter > [noun] > brightness brightness1674 absolute brightness1832 sun power1853 luminosity1906 the world > matter > light > naturally occurring light > [noun] > starlight > brightness of luminosity1906 the world > matter > physics > electromagnetic radiation > [noun] > rate of emission of luminosity1974 the world > matter > physics > electromagnetic radiation > light > intensity of light, luminosity > [noun] > rate, ratio transmittance1919 square law1921 luminosity1974 1906 Astrophysical Jrnl. 33 248 Prevailing opinion.. admits the presence in the heavens of at least a few stars of extraordinary intrinsic brilliancy…stars having a luminosity exceeding that of the Sun by ten-thousand fold or more. 1924 H. Dingle Mod. Astrophysics vi. 74 By brightness we mean—at present, at any rate—the apparent brightness of a star, which will be determined by the star's distance from us as well as by its intrinsic luminosity. 1930 R. H. Baker Astron. ix. 369 The apparent magnitude of a star relates to its brightness as we observe it, depending on its real brightness, or luminosity, and on its distance. 1974 Nature 1 Mar. 34/2 We have..assumed a thermal spectrum, with an electron temperature of 2 × 10⁶ K, in deriving an upper limit to the X-ray luminosity of the source. 1974 Nature 1 Mar. 34/2 A 3σ upper limit was obtained to the source luminosity of 4·0 (±1·0) × 10³² erg s⁻¹ for the energy range 0·5 to 1·5 keV. 2. Something luminous; a luminous point or area. ΘΚΠ the world > matter > light > [noun] > shining or being luminous > something luminous shiner1398 lustre1743 nebulosity1762 luminosity1853 1853 E. K. Kane U.S. Grinnell Exped. xxvii. 223 I thought I saw a luminosity overhead. 1873 R. Browning Red Cotton Night-cap Country iv. 232 Then his face grew one luminosity. 1895 I. Zangwill Master ii. ii. 142 The strange warm luminosities Matt professed to see on London tiles. Compounds Special combinations: luminosity curve n. a graph showing how emitted energy, or perceived brightness, varies with wavelength. ΘΚΠ the world > relative properties > number > graph or diagram > [noun] > graph > showing specific relationship characteristic1881 characteristic curve1881 time curve1883 luminosity curve1886 hysteresis curve1890 hysteresis loop1892 time-distance1892 solidus1901 power curve1908 log log1910 Russell diagram1922 creep curve1931 power curve1932 Hertzsprung–Russell diagram1939 Petersen graph1947 utility curve1948 tournament graph1959 offset1987 1886 Abney & Festing in Philos. Trans. (Royal Soc.) 177 425 By successive alterations in the distance of the comparison-light other pairs of points in the spectrum are determined until the limits of the visible spectrum are reached. The curves of intensities of different parts of the spectrum plotted from these observations will be found to be fairly smooth. This curve we call the ‘luminosity curve’. 1886 Abney & Festing in Philos. Trans. (Royal Soc.) 177 452 We..determined the luminosity-curve of a candle. 1900 Astrophysical Jrnl. 11 220 (heading) Determining the luminosity curve of the solar spectrum. 1937 Nature 6 Mar. 409/2 The maximum of this luminosity curve was at 510 mμ. This was a mean value for forty-eight young observers. 1941 J. D. Cobine Gaseous Conductors xiii. 514 The luminosity curve for an incandescent lamp is shifted slightly toward the long wave lengths compared with sunlight. 1951 Proc. IRE 39 1143/2 The luminosity curve expresses the relation..between the luminance and the radiance of spectrum colors. 1951 Proc. IRE 39 1144/1 Based on the new definition of the lumen, and on the new International Temperature Scale, the peak value of the luminosity curve corresponds to 680 lumens per watt. luminosity function n. Astronomy a function giving the number or proportion of heavenly bodies with an absolute magnitude equal to, or greater than, any chosen value. ΘΚΠ the world > the universe > cosmology > science of observation > astronomical calculation > [noun] > part argumentc1405 astronomicalsa1690 element1788 parameter1829 perturbative function1856 luminosity function1924 Hubble constant1933 Oort constant1941 1924 Astrophysical Jrnl. 59 13 The comparison..is easily made with the aid of what may be called the apparent luminosity function..which expresses the frequencies of absolute magnitudes among the stars brighter than m₀. 1958 Astrophysical Jrnl.: Suppl. Ser. 3 211 Distances of galaxies are correlated with their apparent magnitude; however the uncertainty of the luminosity function of galaxies complicates and weakens the statistical treatment. Draft additions 1997 d. Particle Physics. A parameter of a colliding-beam accelerator, equal to the ratio of the rate of interactions to the reaction cross-section, and proportional to the product of the rates of arrival of particles in the two beams divided by the cross-sectional area of the intersecting region. ΘΚΠ the world > matter > physics > atomic physics > particle physics > particle accelerator > [noun] > types of > collider > parameter of luminosity1964 1964 F. Amman et al. in Proc. Internat. Conf. High Energy Accelerators 1963 250/2 The interaction rate per beam crossing region, ṅ for an event whose cross section is σ..is given by: ṅ=..=Lσ (events/sec)..; the quantity L, measured in cm⁻².s⁻¹ or cm⁻².h⁻¹, includes all the ring parameters and is called luminosity. 1976 Physics Bull. Apr. 159/2 In general, colliding beam devices suffer in comparison with accelerators and conventional solid targets from a relatively low beam-beam interaction rate (or ‘luminosity’) at the intersection. 1980 Nature 7 Feb. 515/2 As the luminosity of storage rings increases rapidly with energy, it is hoped to raise the present 50 per day event rate by a factor of ten. 1985 Sci. Amer. June 64/2 The luminosity of each beam of the SSC is to be 10³³ per second per square centimeter. This entry has not yet been fully updated (first published 1903; most recently modified version published online March 2022). < n.1634
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