A pair of lenses set in a frame worn on the nose and ears in order to correct deficiencies in eyesight or to ornament the face. / (cricket) Synonym of pair (“score of zero runs in both innings”)

(chemistry, physics) Two electrons having opposite spin but all other quantum numbers the same; i.e two electrons in the same atomic orbital or molecular orbital, especially such electrons that function in concert to form a covalent bond

(nautical) A boat, used in competitive rowing, having two rowers, each with a single oar / (rowing, especially in plural) A race in which such craft participate

Synonym of assortative mating

(poker) Two hole cards of the same value.

(chiefly US, colloquial, idiomatic, somewhat vulgar) To be brave; to show some courage, especially in a situation where one has so far failed to do so.

(computing, programming) A software development technique, part of extreme programming, in which two programmers work together at a single keyboard, one coding while the other observes and reviews. The roles are often switched at regular intervals.

(chiefly US, colloquial, idiomatic, somewhat vulgar) To be brave; to show some courage, especially in a situation in which one has so far failed to do so.

plural of au pair

plural of inversion pair