Definition from Wiktionary, the free dictionary
triplet (plural triplets)
- A group of three.
- One one of a group of three.
- One of a group of three siblings born at the same time to the same mother.
- (music) A group of three notes played or written where two notes would ordinarily be; a form of tuplet.
- (physics) A triquark.
a group of three
one of three siblings born at the same time of the same mother
group of three notes played in place of two
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See also 
triplet m (plural triplets)
- triplet (one of three siblings born at the same time)