in concert

WordReference Random House Learner's Dictionary of American English © 2025

con•cert /ˈkɑnsɜrt/   n. 

[countable]
1. Music and Dance a public performance of music or dancing.

Idioms

2. Idioms in concert, [uncountable] together;
   jointly:
   to act in concert.

See -cert-.

WordReference Random House Unabridged Dictionary of American English © 2025

con•cert  (n., adj. kon′sûrt, -sərt;v. kən sûrt′), n. 

1. Music and Dance a public musical performance in which a number of singers or instrumentalists, or both, participate.
2. Music and Dance a public performance, usually by an individual singer, instrumentalist, or the like;
   recital:
   The violinist has given concerts all over the world.
3. agreement of two or more individuals in a design or plan;
   combined action;
   accord or harmony:
   His plan was greeted with a concert of abuse.
4. Idioms in concert, together;
   jointly:
   to act in concert.

adj. 

5. Music and Dance designed or intended for concerts:
   concert hall.
6. Music and Dance performed at concerts:
   concert music.
7. Music and Dance performing or capable of performing at concerts:
   a concert pianist.

v.t. 

8. to contrive or arrange by agreement:
   They were able to concert a settlement of their differences.
9. to plan;
   devise:
   A program of action was concerted at the meeting.

v.i. 

10. to plan or act together.

• Italian concertare to organize, arrange by mutual agreement, perh. parasynthetically from con with + certo certain; Latin concertāre (see concertation) is remote in sense
• French concerter
• Italian concerto; see concerto; (verb, verbal)
• French
• (noun, nominal) 1595–1605

Collins Concise English Dictionary © HarperCollins Publishers::

concert noun / ˈkɒnsɜːt -sət/

1. a performance of music by players or singers that does not involve theatrical staging
   Compare recital1
2. (as modifier): a concert version of an opera
3. agreement in design, plan, or action
4. in concert ⇒ acting in a co-ordinated fashion with a common purpose
5. (of musicians, esp rock musicians) performing live

verb / kənˈsɜːt/

1. to arrange or contrive (a plan) by mutual agreement

Etymology: 16th Century: from French concerter to bring into agreement, from Italian concertare, from Late Latin concertāre to work together, from Latin: to dispute, debate, from certāre to contend