Noun
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the arithmetic operation of summing
calculating the sum of two or more numbers
"the summation of four and three gives seven"
"four plus three equals seven"
-
a useful or valuable quality
Adjective
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involving advantage or good
"a plus (or positive) factor"
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on the positive side or higher end of a scale
"a plus value"
"temperature of plus 5 degrees"
"a grade of C plus"