Standard Lemma guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
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noun
A set of two elements treated as one; a pair.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Synonyms: couple, duad, brace, couplet, doublet, duet, duo, duplet, dyad, pair, twain, twosome, twinsome
Antonyms: none provided
noun
Two persons in an ongoing relationship; a dyadic relationship.
Definition source: English Wiktionary via Wiktextract
Topics: human-sciences, sciences, social-science, sociology
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
The relationship or interaction itself in reference to a couple.
Definition source: English Wiktionary via Wiktextract
Topics: human-sciences, sciences, social-science, sociology
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
Any set of two different pitch classes.
Definition source: English Wiktionary via Wiktextract
Topics: entertainment, lifestyle, music
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
An element, atom, or radical having a valence of or combining power of two.
Definition source: English Wiktionary via Wiktextract
Topics: chemistry, natural-sciences, physical-sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
A chromosome structure, usually X- or V-shaped, consisting of two condensed sister chromatids joined by a centromere.
Definition source: English Wiktionary via Wiktextract
Topics: biology, natural-sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
A secondary unit of organisation consisting of an aggregate of monads.
Definition source: English Wiktionary via Wiktextract
Topics: biology, natural-sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
A tensor of order two and rank one.
Definition source: English Wiktionary via Wiktextract
Topics: mathematics, sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
two items of the same kind
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Synonyms: couple, pair, twosome, twain, brace, span, yoke, couplet, distich, duo, duet, duad
Antonyms: none provided
Broader terms: two, 2, II, deuce
Narrower terms: doubleton
History
From Ancient Greek δυάς (duás), δυάδ- (duád-) from δύο (dúo, “two”), from Proto-Indo-European *duwó, *duwéh3 (*dwóh1). The mathematics sense was coined by American scientist Josiah Willard Gibbs in 1884 in the second half of his book Elements of Vector Analysis.
Across languages
20 source translations are retained for this English entry.
