Cooperate \Co*["o]p"er*ate\, v. i. [imp. & p. p. {Co["o]perated}; p. pr. & vb. n. {Co["o]perating}.] [L. co["o]peratus, p. p. of co["o]perari to co["o]perate; co + operari to work, opus work. See {Operate}.] To act or operate jointly with another or others; to concur in action, effort, or effect. Whate'er co["o]perates to the common mirth. --Crashaw.