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n.
a person who contributes to the fulfillment of a need or furtherance of an effort or purpose; "my invaluable assistant"; "they hired additional help to finish the work"
n.
a person with subordinate membership in a society, institution, or commercial enterprise; "associates in the law firm bill at a lower rate than do partners"
n.
one of the persons who compose a social group (especially individuals who have joined and participate in a group organization); "only members will be admitted"; "a member of the faculty"; "she was introduced to all the members of his family"