con·cert·ed / kənˈsərtəd/ • adj. 1. jointly arranged, planned, or carried out; coordinated: determined to begin a concerted action against them. ∎  strenuously carried out; done with great effort: it would take a concerted effort for a burglar to break into my home.2. (of music) arranged in several parts of equal importance: concerted secular music for voices.

concerted. A perf. of mus. by 2 or more instrumentalists on reasonably equal terms. In opera an ens. is sometimes called a ‘concerted number’.