1. Requirement, requisite refer to that which is necessary. A requirement is some quality or performance demanded of a person in accordance with certain fixed regulations: requirements for admission to college. A requisite is not imposed from outside; it is a factor which is judged necessary according to the nature of things, or to the circumstances of the case: Efficiency is a requisite for success in business. Requisite may also refer to a concrete object judged necessary: the requisites for perfect grooming.

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