polyadn.

Brit.

/ˈpɒlɪad/, U.S.

/ˈpɑliˌæd/

Origin: Formed within English, by derivation. Etymons: poly- comb. form, -ad suffix¹.

Etymology: < poly- comb. form + -ad suffix¹, after monad n., dyad n., triad n., etc.

1. A group of more than two, or (sometimes more generally) of an indeterminate number of things, persons, etc.

ΚΠ

1851 M. E. Lazarus Compar. Psychol. & Universal Analogy I. 205 By the term God, Fourier here means the complex or sum total of creative and conservative forces..whether they are or are not resumed in a monad, dyad, triad, tetrad or polyad.

1898 Proc. Royal Soc. 1897–8 62 334 A theory of compound aggregates is developed... Each element of a poly-ad may consist of singlets, doublets, &c.

1940 Biometrika 31 327 It seems best to confine attention to circular triads,..and to ignore the more ambiguous criteria associated with circular polyads of greater extent.

1992 M. A. Forrester Devel. Young Children's Social-Cognitive Skills viii. 134 The ability to synchronise conversational turn-taking appropriately..increase [sic] over time (age) and is easier to accomplish in dyads than triads (and polyads).

2. spec.

†a. Chemistry. A polyatomic element or radical. Obsolete.

ΘΚΠ

the world > matter > chemistry > valency > [noun] > combining powers of elements > polyatomic element

polyad1870

1870 G. F. Barker Text Bk. Elem. Chem. 32 This third atom, which performs a linking function, must evidently be a polyad, since no monad can join other atoms together.

1879 W. Rossiter Illustr. Dict. Sci. Terms 270/2 Polyads = Poly~atomic elements: triads, tetrads, hexads, &c.

b. Philosophy and Logic. A relative term containing more than two elements.

ΘΚΠ

the mind > mental capacity > philosophy > logic > predicate or propositional logic > [noun] > propositional relation > polyadicity or elements of

polyada1914

polyadicity1918

a1914 C. S. Peirce Coll. Papers (1933) IV. 301 If the number of blanks exceeds two, I term it a Polyad, or Plural Relative.

1982 Jrnl. Symbolic Logic 47 799 In the extended system..inclusion is significant only between relations or polyads of the same degree.

c. Physics. A set of energy levels of a vibrating molecule which would be degenerate if vibrations were harmonic but which actually differ minutely in energy owing to anharmonic interactions with different modes of vibration or rotation.

ΚΠ

1934 G. H. Shortley in Proc. National Acad. Sci. U.S.A. 20 593 Polyad, a set of terms of the same multiplicity based on the same parent term in the case of the addition of one electron to a parent ion... Supermultiplet, radiation resulting from all transitions between two polyads.

1963 Proc. Royal Soc. A. 275 433 The levels may be grouped into ‘polyads’ of levels that would be nearly degenerate in the harmonic approximation.., but which are separated in energy due to the effects of the vibrational anharmonicity.

1997 Science 18 July 348/1 We found analogous rotational difference band structures for the polyads coupling to both (030) and (040) bending states.

This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).

单词	polyad
释义	polyadn. Brit. /ˈpɒlɪad/, U.S. /ˈpɑliˌæd/ Origin: Formed within English, by derivation. Etymons: poly- comb. form, -ad suffix¹. Etymology: < poly- comb. form + -ad suffix¹, after monad n., dyad n., triad n., etc. 1. A group of more than two, or (sometimes more generally) of an indeterminate number of things, persons, etc. ΚΠ 1851 M. E. Lazarus Compar. Psychol. & Universal Analogy I. 205 By the term God, Fourier here means the complex or sum total of creative and conservative forces..whether they are or are not resumed in a monad, dyad, triad, tetrad or polyad. 1898 Proc. Royal Soc. 1897–8 62 334 A theory of compound aggregates is developed... Each element of a poly-ad may consist of singlets, doublets, &c. 1940 Biometrika 31 327 It seems best to confine attention to circular triads,..and to ignore the more ambiguous criteria associated with circular polyads of greater extent. 1992 M. A. Forrester Devel. Young Children's Social-Cognitive Skills viii. 134 The ability to synchronise conversational turn-taking appropriately..increase [sic] over time (age) and is easier to accomplish in dyads than triads (and polyads). 2. spec. †a. Chemistry. A polyatomic element or radical. Obsolete. ΘΚΠ the world > matter > chemistry > valency > [noun] > combining powers of elements > polyatomic element polyad1870 1870 G. F. Barker Text Bk. Elem. Chem. 32 This third atom, which performs a linking function, must evidently be a polyad, since no monad can join other atoms together. 1879 W. Rossiter Illustr. Dict. Sci. Terms 270/2 Polyads = Poly~atomic elements: triads, tetrads, hexads, &c. b. Philosophy and Logic. A relative term containing more than two elements. ΘΚΠ the mind > mental capacity > philosophy > logic > predicate or propositional logic > [noun] > propositional relation > polyadicity or elements of polyada1914 polyadicity1918 a1914 C. S. Peirce Coll. Papers (1933) IV. 301 If the number of blanks exceeds two, I term it a Polyad, or Plural Relative. 1982 Jrnl. Symbolic Logic 47 799 In the extended system..inclusion is significant only between relations or polyads of the same degree. c. Physics. A set of energy levels of a vibrating molecule which would be degenerate if vibrations were harmonic but which actually differ minutely in energy owing to anharmonic interactions with different modes of vibration or rotation. ΚΠ 1934 G. H. Shortley in Proc. National Acad. Sci. U.S.A. 20 593 Polyad, a set of terms of the same multiplicity based on the same parent term in the case of the addition of one electron to a parent ion... Supermultiplet, radiation resulting from all transitions between two polyads. 1963 Proc. Royal Soc. A. 275 433 The levels may be grouped into ‘polyads’ of levels that would be nearly degenerate in the harmonic approximation.., but which are separated in energy due to the effects of the vibrational anharmonicity. 1997 Science 18 July 348/1 We found analogous rotational difference band structures for the polyads coupling to both (030) and (040) bending states. This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < n.1851
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