What does the word twin mean?

Usage examples for twin

  1. Emerson was, and described, one twin when he wrote, 'The gentleman is a man of truth, lord of his own actions, and expressing that lordship in his behavior; not in any manner dependent or servile, either on persons, or opinions, or possessions. – The Perfect Gentleman by Ralph Bergengren
  2. System and Results- these were his twin gods. – Fanny Herself by Edna Ferber
  3. There are plenty with better features, no doubt, but if I'd had my choice as to looks, I should have been his twin. – The Title Market by Emily Post