A person or organization that works together with others, especially in a cooperative venture.
From 'cooperate' + '-or' (agent suffix meaning someone who performs an action). The '-or' suffix is used to denote the doer of an action, similar to '-er'.
A cooperator is fundamentally different from a competitor—the word itself encodes this distinction. In evolutionary biology, scientists study why humans are so good at being cooperators, since this ability to trust and work together gave our species an incredible advantage.
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