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

As for what’s next, the triplets have trips planed to visit their cousins in Miami before heading to Martha’s Vineyard for a large family gathering. — David Chiu, PEOPLE, 10 July 2026

And Williams’ triplets with Lasichanh wore blue and white matching sets too. — Julia Teti, Footwear News, 24 June 2026

Doctors at Allegheny Health Networks' West Penn Hospital delivered four sets of triplets recently. — Michael Guise, CBS News, 20 June 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