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From The Collaborative International Dictionary of English v.0.48:
Quintuplet \Quin"tu*plet\, n. [From Quintuple.] 1. A collection or combination of five of a kind. [Webster 1913 Suppl.] 2. pl. Five children born in the same labor. [Webster 1913 Suppl.] 3. (Mus.) A group of five connected notes; a turn of five notes. [Webster 1913 Suppl.] 4. A cycle having five crank shafts and adapted for five riders, all of whom can assist in the propulsion. [Webster 1913 Suppl.]