A note in music that is 1/3 of a beat. Also called 12th notes(8th note triplets) or 24th notes(16th note triplets).
In 4/4 time:
8th note triplet = 1/12 measure
16th note triplet = 1/24 measure
one of three children born at the same time from the same pregnancy
me and my two brothers are triplets; we celebrate our birthday together.