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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)
1 Inverse: 2  denotes the modular multiplicative inverse, which is defined if and only if and are relatively prime, which is the case when the left hand side is defined: . 3  Distributive: 4  Division (definition): , when the right hand side is defined.