Webster's English Dictionary

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cooperate

co.op.er.ate \ko--'a:p-(*-).ra-t\ \-.ra-t-*t\ vi [LL cooperatus, pp. of 
   cooperari, fr. L co- + operari t]o work - more at OPERATE 1: to act or work 
   with another or others  2: to associate with another or others for mutual 
   often economic benefit  - co.op.er.a.tor n