Source : Webster's Revised Unabridged Dictionary (1913)

Quintuplet \Quin"tu*plet\, n. [From {Quintuple}.]
   1. A collection or combination of five of a kind.

   2. pl. Five children born in the same labor.

   3. (Mus.) A group of five connected notes; a turn of five
      notes.

   4. A cycle having five crank shafts and adapted for five
      riders, all of whom can assist in the propulsion.

Source : WordNet®

quintuplet
     n 1: the cardinal number that is the sum of four and one [syn: {five},
           {5}, {V}, {cinque}, {quint}, {quintet}, {fivesome}, {pentad},
           {fin}, {Phoebe}, {Little Phoebe}]
     2: one of five children born at the same time from the same
        pregnancy [syn: {quint}, {quin}]