con‧cert‧ed /kənˈsɜːtəd, kənˈsɜːtɪd $ -ɜːr-/
adjective[
Date: 1700-1800;
Origin: concert 'to do together or by agreement' (16-21 centuries), from French concerter, from Old Italian concertare, from Latin, 'to fight, compete', from com- ( ⇒ COM-) + certare 'to make great efforts']
concerted effort/action/attack etc a concerted effort etc is done by people working together in a carefully planned and very determined way:
Libraries have made a concerted effort to attract young people.—concertedly adverb [TahlilGaran] Dictionary of Contemporary English ▲