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

While the beloved green hero made his first parade appearance back in 2007, this marked the very first time Shrek, Fiona their adorable triplets Felicia, Fergus and Farkle, and their loyal friends Donkey, Gingy and Pinocchio have traveled to New York City together. —Dave Quinn, PEOPLE, 27 Nov. 2025

Skyler Gisondo and Marcello Hernández will be playing Farkle and Fergus, Shrek and Princess Fiona’s sons and brothers/triplets to Felicia, voiced by Zendaya. —Alejandra Gularte, Vulture, 27 Nov. 2025

The new film will see the return of Cameron Diaz and Mike Myers as Fiona and Shrek and adds Zendaya as one of the couple's triplets. —Lori A Bashian, FOXNews.com, 22 Nov. 2025

With an efficiency exceeding 98%, energy from the triplet state is transferred to the lanthanide ions in the nanoparticle, resulting in brilliant light emission. —Mrigakshi Dixit, Interesting Engineering, 19 Nov. 2025

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