What does the word elective mean?

Usage examples for elective

  1. In the United States, the monument to its influence is the elective system. – An American at Oxford by John Corbin
  2. Very true; but you cannot say the same of some of the Roman Elegies and of that monstrous book the Elective Affinities. – Hyperion by Henry Wadsworth Longfellow
  3. The dancing class went briskly on; so did the Livy class and the geometry, the English 1, the French required and the history elective. – Betty Wales Freshman by Edith K. Dunton