Source : WordNet®

troika
     n 1: a Russian carriage pulled by three horses abreast
     2: the cardinal number that is the sum of one and one and one
        [syn: {three}, {3}, {III}, {trio}, {threesome}, {tierce},
        {leash}, {triad}, {trine}, {trinity}, {ternary}, {ternion},
         {triplet}, {tercet}, {terzetto}, {trey}, {deuce-ace}]
     3: a modern Russian triumvirate