concert n 1. (Music, other) a. a performance of music by players or singers that does not involve theatrical staging. Compare recital 1 b. ( as modifier ): a concert version of an opera. 2. agreement in design, plan, or action 3. acting in a co-ordinated fashion with a common purpose 4.. in concert 1. Literally, performing a musical concert. They're one of my favorite bands, but strangely I've never seen them in concert. 2. Together; in cooperation. The two of us will need to work in concert if we're going to get through all these files. The local police department has been investigating in concert with federal agencies. To act in harmony or conjunction; to form combined plans. Agreement in a design or plan; union formed by mutual communication of opinions and views; accordance in a scheme; harmony; simultaneous action. Musical accordance or harmony; concord. A musical entertainment in which several voices or instruments take part. "/>Concert meaning