- Adjective. (chiefly, North America) Involving direct communication between two people.
- Adjective. (sports) involving one attacker and one defender.
- Adjective. (mathematics) bijective or injective.
- Noun. A contest involving only one player on each side, especially of an activity often involving teams.
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This entry was last updated on RefTopia from its source on 3/20/2012.