additive inverse

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additive inverse

n.
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Noun1.additive inverse - (mathematics) one of a pair of numbers whose sum is zero; the additive inverse of -5 is +5
math, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
inverse, opposite - something inverted in sequence or character or effect; "when the direct approach failed he tried the inverse"