(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.

(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

(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.

(poker) Two hole cards of the same value.

plural of kilobase pair

(chiefly Britain, rare or dated) A flight of stairs

plural of homologous pair

(genetics) One thousand base pairs in succession (used as a measure of the size of a nucleic acid or a gene)

plural of pocket pair