(chemistry) A pair of electrons in the valence shell of an atom that does not participate in bonding.

A relationship, often permanent, formed between a male and female animal; initiated during courtship and maintained after mating.

(phonology) A pair of words differing by only one phonetic segment or suprasegment, used to prove the validity of a proposed phoneme, toneme, or chroneme.

(physics) A pair of electrons (or other fermions), of opposite spin, whose theorised behaviour is the basis of the BCS theory of superconductivity.

plural of linear pair

plural of minimal pair

An item of clothing that is worn under one's trousers or pants.

plural of ordered pair

A single garment that covers one's legs individually with sleeves, and also covers the pelvis. / (topology) The orientable surface of genus zero having three boundary components.

(US, politics) Two members of Congress who would have otherwise cast opposing votes, but who form an agreement whereby one announces the couple is a live pair and registers his or her own vote as present rather than for or against. Although not recognized or recorded in vote tallies, the effect is to allow the other member to be absent without affecting the outcome of the vote.