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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)
The additive inverse property of any number is the same number with the opposite sign. When a number and its additive inverse are added to one another, the result is always 0 (zero) - the identity element for addition. The additive inverse property of 12 is -12, AND the additive inverse property of -12 is 12.