cooperate
Co*öp"er*ate, v. i. [imp. & p.p. Coöperated; p.pr. & vb.n. Coöperating.] Etym: [L. coöperatus, p.p. of coöperari to coöperate; co + operari to work, opus work. See Operate.] Defn: To act or operate jointly with another or others; to concur in action, effort, or effect. Whate'er coöperates to the common mirth. Crashaw.