Terzetto is a term used in music to describe a composition or performance for three voices or instruments. The word itself is of Italian origin, derived from the Latin word "tertius" meaning "third". Synonyms for terzetto include trio, threesome, triptych, triumvirate, triplet, and triad. A trio is a group of three people or things, while a triptych is a work of art consisting of three panels. A triumvirate refers to a group of three individuals who share power, while a triplet is a set of three identical elements. A triad, on the other hand, is a set of three related things or concepts. Regardless of the term used, a terzetto is a beautiful and harmonious performance when executed correctly.