CONCERT, noun 1. Agreement of two or more in a design or plan; union formed by mutual communication of opinions and views; accordance in a scheme; harmony. The allies were frustrated for want of concert in their operations. The Emperor and the Pope acted in concert 2. A number or company of musicians, playing or singing the same piece of music at the same time; or the music of a company of players or singers, or of both united. 3. A singing in company. 4. Accordance; harmony.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI