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Definition of Minus-plus sign
1. Noun. (mathematics) the symbol ?, meaning "minus or plus", used alongside the plus-minus sign to show that a negative value is to be taken where the positive value is indicated by the plus-minus sign, and ''vice versa'' (as in (x ± 1) / (x ? 2), which means (x + 1) / (x - 2) and (x - 1) / (x + 2)). ¹
¹ Source: wiktionary.com