Meaning of “cooperative” - Learner’s Dictionary

cooperative

adjective ( also UK co-operative) uk us /kəʊˈɒpərətɪv/
WILLING TO HELP

B2 willing to help or do what people ask:

a cooperative and polite employee
WORKING TOGETHER

involving people working together to achieve the same aim:

a cooperative relationship
cooperatively adverb

(Definition of “cooperative adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)