cooperative

Concise Oxford English Dictionary © 2008 Oxford University Press:
cooperative /kəʊˈɒpərətɪv/ (also co-operative)

▶adjective

• 1 involving cooperation.

• 2 willing to be of assistance.

• 3 (of a farm, business, etc.) owned and run jointly by its members, who share the profits or benefits.

▶noun a cooperative organization.

– derivatives
cooperatively adverb,
cooperativeness noun.