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We have one entry that includes the term plusminus.
plus/minus sign
noun: 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")
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Merriam-Webster unabridged
