all the parts of a thing taken together, so that each part is considered only in relation to the whole.
2.
the entire costume of an individual, especially when all the parts are in harmony: She was wearing a beautiful ensemble by one of the French designers.
c.1440, from M.Fr. ensemblee "all the parts of a thing considered together," from L.L. insimul "at the same time," from in- intensive prefix + simul "at the same time." Musical sense first attested in Eng. 1844.