Definition of "triplet" [trip•let]

• A group or set of three of one kind. (noun)
• One of three children born at one birth. (noun)
• A group of three lines of verse. (noun)
• Music A group of three notes having the time value of two notes of the same kind. Also called tercet. (noun)
• Physics A multiplet with three components. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Consider a certain triplet in relation to the triplet which is complementary to it on the other chain of the double helix."
• "Thus if the first triplet is UCC, we consider it in relation to either AGG or (reading in the opposite direction) GGA."
• "The Divine Comedy is written in the _terza rima_, which consists of three verses arranged in such a way that the middle line of each triplet rhymes with the first or third verse of the succeeding triplet."