What does triplet mean?
A triplet is a group or set of three, whether people, objects, musical notes, genetic units, or other elements. The word is also used for one of three children born at the same time, a familiar sense in family and medical contexts. In music, a triplet consists of three notes performed in the time usually occupied by two notes of equal value. In biology, a triplet is a sequence of three nucleotides in DNA or RNA and forms the basic unit of many genetic codes. The term can further refer to a quantum state involving three subatomic particles with the same spin. In ordinary use, “triplet” emphasizes that a group contains exactly three members. It is useful because it identifies a specific number more directly than the general word “trio” while also covering specialized scientific and musical contexts.
A group or set of three people or things; one of three children born at the same time; a group of three musical notes performed in the time normally occupied by two; or a sequence of three nucleotides.
"A triplet of candidates was interviewed for the position."
The musical and genetic senses are technical, while the family sense is widely understood.
Consisting of, arranged as, or involving three.
"The results formed a clear triplet pattern across the three samples."
This adjective is less common than the noun and often appears in technical or attributive constructions.
Use “triplets” for the three children born together or for multiple groups or units of three, depending on context.
"The triplets celebrated their eighteenth birthday together."
A DNA triplet may be only three chemical letters long, yet it carries instructions essential to building proteins.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does triplet come from?
The word entered English from French triplet, a diminutive of triple meaning “threefold” or “a set of three.” English triple comes from Latin triplex, a threefold form built on the Latin numeral root meaning “three.” Related English words such as triplicate and triplication were developed through the same Latin tri- combination, reflecting the long history of this root in expressions concerning three, multiples, and repetition.
How triplet is actually used
The everyday sense is neutral and applies broadly to any group of three. The musical, genetic, and particle-physics senses are specialist terms, while the reference to children born together is common in family and medical contexts.
Easily confused with triplet
A triple is generally an amount or quantity consisting of three, while a triplet is more often a group, a person, a musical figure, or a three-unit genetic sequence.