Source : WordNet®

III
     n : the cardinal number that is the sum of one and one and one
         [syn: {three}, {3}, {trio}, {threesome}, {tierce}, {leash},
          {troika}, {triad}, {trine}, {trinity}, {ternary}, {ternion},
          {triplet}, {tercet}, {terzetto}, {trey}, {deuce-ace}]