What does the word pair mean?

Usage examples for pair

  1. I have a pair on. – The Crofton Boys by Harriet Martineau
  2. " One pair more or less doesn't make much difference," said Olga. – The Keeper of the Door by Ethel M. Dell
  3. Ruby an' he'll make a han'some pair. – I Saw Three Ships and Other Winter Tales by Arthur Thomas Quiller-Couch