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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)
Definition of Additive Inverses. The Additive Inverse of a number is the opposite of the number. A number and its opposite add up to give zero. They are called additive inverses of each other. 1  The additive inverse of 7 is - 7. 2  7 + (- 7) = 0.  The additive inverse of - 2 is 2.