Cooperate \Co*["o]p"er*ate\, v. i. [imp. & p. p. {Cooperated}; p. pr. & vb. n. {Cooperating}.] [L. cooperatus, p. p. of cooperari to cooperate; co + operari to work, opus work. See {Operate}.] To act or operate jointly with another or others; to concur in action, effort, or effect. [1913 Webster] Whate'er cooperates to the common mirth. --Crashaw. [1913 Webster]