Together; all at once; simultaneously.n. The union of parts in a whole; all the parts of anything taken together, so that each part is considered only in relation to the whole; specifically, the general effect of a work of art, piece of music, drama, etc.n. In music, the union of all the performers in a concerted composition, as in a chorus with full orchestral accompaniment.n. In mathematics, a manifold or collection of elements, discrete or continuous, finite, infinite, or superinfinite.In music, same as concerted: as, an ensemble passage or work.