(uncountable) Agreement in a design or plan; union formed by mutual communication of opinions and views; accordance in a scheme; harmony; simultaneous action.

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.

Used other than figuratively or idiomatically: see in, concert. / Acting together

Concerted activity; something done together by two or more people.

(US) To perform in concerts / To adapt to the concert form

present participle of concert

Performed through a concert of effort; done by agreement or in combination. / (music) Having separate parts for voices and instruments.

simple past tense and past participle of concert

Third-person singular simple present indicative form of concert

A form of dialogue and co-decision, implying the mutual exchange of information, open discussion and knowledge sharing, and the signature of operational agreements between public administrations and/or with representatives of the private sector.