plus/minus sign

noun

Definition of plus/minus sign

  1. :  the sign ± used to indicate a quantity (as 2 in “the square root of 4 is ±2”) taking on both an algebraically positive value and its negative and to indicate a plus or minus quantity (as 4 in “the population age was 30 ± 4 years”) —called also plus/minus symbol

1971

First Known Use of plus/minus sign

1971


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