triplet

noun

trip·​let ˈtri-plət 

plural triplets

1

: one of three offspring produced in the same pregnancy

2

a

: a combination, set, or group of three

b

: a group of three elementary particles (such as positive, negative, and neutral pions) with different charge states but otherwise similar properties

c

: an atom or molecule with an even number of electrons that have a net magnetic moment

d

: codon

3

: a group of three musical notes, tones, or beats performed in the time of two of the same value

4

: a unit of three lines of verse

Synonyms of triplet

• trio
• triad

Examples of triplet in a Sentence

the theater piece is actually a triplet of comedy sketches, all of them having romantic love as their theme

Recent Examples on the Web

Avtar Singh was a devoted temple member and father to 6-month-old triplets, according to community members. —Alex Wigglesworth, Los Angeles Times, 25 Feb. 2026

Just over two years ago, Stillwater parents Brian and Coleen Groen sent two of their triplet 6-year-old sons to a friend’s house for a sleepover. —Nick Ferraro, Twin Cities, 25 Feb. 2026

It is designed to validate the new magnet system, the inner triplet beam-focusing magnets, and its complex infrastructure, which is a crucial element in LHC’s major upgrade set to enter operation in 2030. —Georgina Jedikovska, Interesting Engineering, 24 Feb. 2026

Her triplet sisters, Petra and Rachel, are also musicians. —Hanna Wickes, Kansas City Star, 24 Feb. 2026

Word History

Etymology

triple entry 2

First Known Use

1656, in the meaning defined at sense 4

Kids Definition

triplet

noun

trip·​let ˈtrip-lət 

1

: a unit of three lines of verse

2

: a combination, set, or group of three

3

: one of three children or offspring born at one birth

4

: a group of three notes played in the time of two of the same value

Medical Definition

triplet

noun

trip·​let ˈtrip-lət 

1

a

: a combination, set, or group of three

b

: an atom or molecule with an even number of electrons that have a net magnetic moment

c

: codon

2

a

: one of three children or offspring born at one birth

b

triplets plural : a group of three offspring born at one birth

3

: a combination of three lenses