To assist someone or comply with their requests. To do something or to carry out an act with the aim of helping or assisting the person you are collaborating with.

verb; cooperated, cooperating. 1. to work or act together or jointly for a common purpose or benefit. 2. to work or act with another or other persons willingly and agreeably.

<“He called upon my help, and i decided to cooperate with his request”>

synonyms: collaborate, work together, work side by side, act together, act jointly, pull together, band together, come together, get together, join forces, team up, unite, combine, merge, amalgamate, pool resources, club together, make common cause, form an alliance.

Cooperative is the human state in which the people who are cooperating have decided to eliminate the negative traits of self ego, attention seeking, arrogance, pride, love of money, love of power, envy, competition etc, from interfering with the relationship which sustains their cooperation.

Also read about the meaning of the word cooperation.