1. Adjective.  (chiefly, North America) Involving direct communication between two people.
  2. Adjective.  (sports) involving one attacker and one defender.
  3. Adjective.  (mathematics) bijective or injective.
  4. Noun.  A contest involving only one player on each side, especially of an activity often involving teams.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.