working or acting together willingly for a common purpose or benefit.

demonstrating a willingness to cooperate

The librarian was cooperative in helping us find the book.

pertaining to economic cooperation

a cooperative business.

involving or denoting an educational program comprising both classroom study and on-the-job or technical training, esp. in colleges and universities.

a jointly owned enterprise engaging in the production or distribution of goods or the supplying of services, operated by its members for their mutual benefit, typically organized by consumers or farmers.

Also called co-op , cooperative apartment.

a building owned and managed by a corporation in which shares are sold, entitling the shareholders to occupy individual units in the building.

an apartment in such a building. Compare condominium ( defs. 1, 2 ) .