Triplet (noun)

1. A group of three things, especially musical notes, considered as a unit.
2. A group of three offspring born at one birth.

Origin:

Late 16th century (denoting a group of three notes sung to two syllables in medieval music): from latin triplus 'threefold', from tri- 'three' + -plus 'fold'. .

Examples:

1. The dancers did a quick triplet before continuing with the routine.
2. She was delighted to learn she was carrying triplets.
3. In genetics, a codon is a sequence of three nucleotides that corresponds to a specific amino acid.
4. The three stars of the Orion's belt are referred to as a triplet.
5. The triplet motif of the song repeats throughout the entire piece.