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The additive inverse of a number is the opposite of that number, that is, the additive inverse of a number x is -x. The sum of a number and its additive inverse is always zero, that is, x + (-x) = 0. Related Terms: addition, number, opposites, sum, zero. English | Espaol.
(mathematics) one of a pair of numbers whose sum is zero; the additive inverse of -5 is +5. Classified under: Nouns denoting relations between people or things or ideas. Hypernyms (additive inverse is a kind of...): inverse; opposite (something inverted in sequence or character or effect)