What is the meaning of pair?

noun

• A set of two similar things considered as a unit.
  • synonyms: brace
• Two items of the same kind.
  • synonyms: couple, twosome, twain, brace, span, yoke, couplet, distich, duo, duet, dyad, duad
• Two people considered as a unit.
• A poker hand with 2 cards of the same value.

verb

• Form a pair or pairs.
  • usage: "The two old friends paired off"
  • synonyms: pair off, partner off, couple
• Bring two objects, ideas, or people together.
  • usage: "This fact is coupled to the other one"; "Matchmaker, can you match my daughter with a nice young man"; "The student was paired with a partner for collaboration on the project"
  • synonyms: match, mate, couple, twin
• Occur in pairs.
  • synonyms: geminate
• Arrange in pairs.
  • usage: "Pair these numbers"
  • synonyms: geminate
• Engage in sexual intercourse.
  • usage: "Birds mate in the Spring"
  • synonyms: copulate, mate, couple