additive inverse

Etymology
So called because the sum of a number and its additive inverse is the additive identity.

Noun

 * 1)  The inverse with respect to addition; the opposite.
 * The additive inverse of 12 is −12.

Synonyms

 * negative, opposite

Translations

 * Finnish:
 * German: additives Inverses,
 * Polish: liczba przeciwna
 * Portuguese: elemento inverso