What is the meaning of Concert?

To plan together; to settle or adjust by conference, agreement, or consultation.

To plan; to devise; to arrange.

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 (musical entertainment)

Source: wiktionary.org

See also