working or acting together willingly for a common purpose or benefit.
2.
demonstrating a willingness to cooperate: The librarian was cooperative in helping us find the book.
3.
pertaining to economic cooperation: a cooperative business.
4.
involving or denoting an educational program comprising both classroom study and on-the-job or technical training, especially in colleges and universities.
noun
5.
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.
c.1600, from L. cooperat-, pp. stem of cooperari (see cooperation) + -ive. Political economy sense is from 1808, from the pre-Marx communist movement. The noun meaning "a cooperative store" is from 1883; meaning "a cooperative society" is from 1921.