Dictionary

plus/minus sign

noun

Definition of PLUS/MINUS SIGN

:  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

First Known Use of PLUS/MINUS SIGN

1971

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