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First in importance, degree, or rank.
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First in time, order, or sequence.
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First in excellence, quality, or value.
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(mathematics, lay) Having exactly two integral factors: itself and unity (1 in the case of integers).
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(mathematics, technical) Such that if it divides a product, it divides one of the multiplicands.
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(algebra, of an ideal) Having its complement closed under multiplication.
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(algebra, of a nonzero module) Such that the annihilator of any nonzero submodule is equal to the annihilator of the whole module.
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Marked or distinguished by the prime symbol.
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Early; blooming; being in the first stage.
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(obsolete) Lecherous, lewd, lustful.