Triplet/ˈtrɪplət/ Definition 1 of 5Pro Tip 1/2Matching Set Used to describe a set where the components have a similar nature or purpose. The artisan showcased a triplet of hand-crafted jars. Pro Tip 2/2Collection Implication Implies a certain completeness or wholeness for the set. Her necklace collection included a beautiful triplet of emeralds.