This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Planned or accomplished together; combined: We made a concerted effort to solve the problem.

adj. Music Arranged in parts for voices or instruments.

v. Simple past tense and past participle of concert.

adj. Performed through a concert of effort; done by agreement or in combination.

adj. Having separate parts for voices and instruments

adj. Mutually contrived or planned; agreed on.

Mutually agreed upon, contrived, or planned.

Brought into connection or relation; connected by a plan.

In music, arranged in parts for several voices or instruments, as a trio, a quartet, etc.

adj. involving the joint activity of two or more

"He said the move was staged by Democrats to avoid investigating what he called a concerted effort by Perdue to circumvent the laws so the campaign could hide flights offered by donors who had already exceeded the $4,000 maximum donation per election."

joint   

preconcerted   

alerted    asserted    averted    blurted    converted    deserted    diverted    exerted    flirted    inserted   

simultaneous    convulsive    frenzied    decisive    abortive    all-out    wordless    fruitless    upward    involuntary