plus/minus sign

noun

Definition of plus/minus sign 

: the sign ± used to indicate a quantity (such 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 (such as 4 in "the population age was 30 ± 4 years")

called also plus/minus symbol

First Known Use of plus/minus sign

1971, in the meaning defined above

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The first known use of plus/minus sign was in 1971

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