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Definition of prime
prime - adj. used of the first or originating agent; being at the best stage of development; of or relating to or being an integer that cannot be factored into other integers; first in rank or degree; of superior grade; noun a number that has no factor but itself and 1; the time of maturity when power and vigor are greatest; the second canonical hour; about 6 a.m.; the period of greatest prosperity or productivity; verb insert a primer into (a gun, mine, or charge) preparatory to detonation or firing; fill with priming liquid; cover with a primer; apply a primer to.
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