Source : WordNet®

fivesome
     n 1: the cardinal number that is the sum of four and one [syn: {five},
           {5}, {V}, {cinque}, {quint}, {quintet}, {quintuplet}, {pentad},
           {fin}, {Phoebe}, {Little Phoebe}]
     2: five people considered as a unit [syn: {quintet}, {quintette}]