kōˈäpəˌrād.ə(r), -ātə- also (ˈ)kō|ä- noun
( -s )
Etymology: Late Latin, from cooperatus + -or — more at cooperate
1. : one that cooperates:
a. : coworker, colleague , collaborator
the cooperators with whom he worked
b. : one who follows with thoroughness the directions or suggestions of a government, governmental agency, or political party
soil conservation programs gaining more cooperators
2. : a member of a cooperative : an advocate of cooperative principles and practices