dyad

n.

1. Two individuals or units regarded as a pair: the mother-daughter dyad.
2. Biology. One pair of homologous chromosomes resulting from the division of a tetrad during meiosis.
3. Chemistry. A divalent atom or radical.
4. Mathematics.
   1. A function that draws a correspondence from any vector u to the vector (v·u)w and is denoted vw, where v and w are a fixed pair of vectors and v·u is the scalar product of v and u. For example, if v = (2,3,1), w = (0,−1,4), and u = (a,b,c), then the dyad vw draws a correspondence from u to (2a + 3b + c)w.
   2. A tensor formed from a vector in a vector space and a linear functional on that vector space.

adj.
Made up of two units.

[From Greek duas, duad-, from duo, two.]

Pair (of countries, usually). The term is most used in international relations research, especially peace studies, where all dyads are examined to investigate the causes of war—a line of research begun by L. F. Richardson. It turns out that there are few wars between Switzerland and Nepal.

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Dansk (Danish)
n. - dyade
adj. - ve-, to-

Nederlands (Dutch)
twee-eenheid, tweewaardig (element)

Français (French)
n. - dualité
adj. - deux, double, dual, dualiste

Deutsch (German)
n. - Zweiheit, (Mus.) Zweiklang
adj. - Zweier..., Doppel...

Ελληνική (Greek)
n. - δυάδα, δύο, ζευγάρι, (χημ.) δισθενές στοιχείο ή άτομο

Italiano (Italian)
coppia

Português (Portuguese)
n. - díade (f) (Morfol.) (Citol.), binário (m)

Русский (Russian)
пара, двухвалентный атом

Español (Spanish)
n. - pareja, par, grupo de dos
adj. - de dos partes

Svenska (Swedish)
n. - tvåtal

中文（简体）(Chinese (Simplified))
二数, 二元一位, 一对, 二的, 一双的, 二分体的, 二价原子或元素的

中文（繁體）(Chinese (Traditional))
n. - 二數, 二元一位, 一對
adj. - 二的, 一雙的, 二分體的, 二價原子或元素的

한국어 (Korean)
n. - 한 쌍, 두 벡터의 곱, 의미 있는 대화
adj. - 한 쌍의

日本語 (Japanese)
n. - 二個群, ダイアド
adj. - ダイアドの和, 二の

العربيه (Arabic)
‏(الاسم) زوج, اثنان‏

עברית (Hebrew)
n. - ‮זוג, יסוד כימי עם ערכיות 2, גודל המצורף משני וקטורים (מתמטיקה)‬
adj. - ‮כפול‬

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