What is the meaning of Triplet?

A set of three, particularly

A group of three notes played or written where two notes would ordinarily be; a form of tuplet.

A triquark.

A quantum state with three allowed projections for the spin.

A constructed gem consisting of a thin slice of natural opal sandwiched between a clear glass or quartz top and a synthetic or stone backing that enhances the colour of the opal.

One of a group of three, particularly

  1. One of a group of three siblings born at the same time to the same mother.

One of a group of three siblings born at the same time to the same mother.

triplet, group of three things

triplet (each one of the three beings resulting from the same pregnancy)

triplet (set of three)

triplet

Source: wiktionary.org