Con·cert'ed adjective Mutually contrived or planned; agreed on; as, concerted schemes, signals. Concerted piece (Mus.) , a composition in parts for several voices or instrument, as a trio, a quartet, etc. Found on http://www.encyclo.co.uk/webster/C/127
contrived or arranged by agreement; planned or devised together: a concerted effort. · done or performed together or in cooperation: a concerted attack. · arranged in parts for several voices or instruments. Found on https://www.infoplease.com/dictionary/concerted