con ‧ cert ‧ ed /kənˈsɜːtəd, kənˈsɜːtɪd $ -ɜːr-/ BrE AmE 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