additive inverse

Noun
  1. (mathematics) one of a pair of numbers whose sum is zero;
    The additive inverse of -5 is +5 (synset 113865200)
    referred to in: math, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
    is a type of: inverse, opposite - something inverted in sequence or character or effect

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