Additive Inverse Definition
    noun
  
 The number that must be added to a number to equal zero.
 −5 is the additive inverse of 5
 Webster's New World 
Other Word Forms of Additive Inverse
Noun
Singular:
 additive inversePlural:
 additive inversesOrigin of Additive Inverse
So called because the sum of a number and its additive inverse is the additive identity.
From Wiktionary
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