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â¢ ADDITIVE INVERSE (noun) The noun ADDITIVE INVERSE has 1 sense: 1. (mathematics) one of a pair of numbers whose sum is zero; the additive inverse of -5 is +5. Familiarity information: ADDITIVE INVERSE used as a noun is very rare. Dictionary entry details. â¢ ADDITIVE INVERSE (noun)
exists and is an alternate of. Merge this question into. Split and merge into it. Answer by Isadora Duncan. Confidence votes 51.7K. The opposite of a number is also called an additive inverse. An additive inverse of a number a is the number that, when added to a, yields zero.