Dictionary

Two similar or identical things taken together; often followed by of.

Example: I couldn't decide which of the pair of designer shirts I preferred, so I bought the pair.

Two people in a relationship, partnership or friendship.

Example: Spouses should make a great pair.

Used with binary nouns (often in the plural to indicate multiple instances, since such nouns are plural only, except in some technical contexts)

Example: a pair of scissors; two pairs of spectacles; several pairs of jeans

A couple of working animals attached to work together, as by a yoke.

Example: A pair is harder to drive than two mounts with separate riders.

An exciting or extraordinary scene, exhibition, performance etc.

Example: The horse race was a thrilling spectacle.

An embarrassing or unedifying scene or situation.

Example: He made a spectacle out of himself.

(usually in the plural) An optical instrument consisting of two lenses set in a light frame, and worn to assist sight, to obviate some defect in the organs of vision, or to shield the eyes from bright light.

An aid to the intellectual sight.

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.