| Noun | 1. | twain - two items of the same kindcouplet, distich, duad, duet, duo, dyad, twosome, brace, pair, span, yoke, couple 2, II, two, deuce - the cardinal number that is the sum of one and one or a numeral representing this number doubleton - (bridge) a pair of playing cards that are the only cards in their suit in the hand dealt to a player | |