Noah Webster's Dictionary 1. (v. t.) To plan together; to settle or adjust by conference, agreement, or consultation. 2. (v. t.) To plan; to devise; to arrange. 3. (v. i.) To act in harmony or conjunction; to form combined plans. 4. (v. t.) Agreement in a design or plan; union formed by mutual communication of opinions and views; accordance in a scheme; harmony; simultaneous action. 5. (v. t.) Musical accordance or harmony; concord. 6. (n.) A musical entertainment in which several voices or instruments take part.

Multi-Version Concordance Concert (1 Occurrence) Psalms 64:5 They encourage themselves in an evil matter, they concert to hide snares; they say, Who will see them? (DBY)