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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.
additive inverse - (mathematics) one of a pair of numbers whose sum is zero; the additive inverse of -5 is +5. 1  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.