plus

(noun) a useful or valuable quality. Synonyms: asset.

(noun) the arithmetic operation of summing; calculating the sum of two or more numbers. Synonyms: summation, addition. Examples: "The summation of four and three gives seven." "Four plus three equals seven."

(adj) on the positive side or higher end of a scale. Synonyms: plus (vs. minus). Examples: "A plus value." "Temperature of plus 5 degrees." "A grade of c plus."

(adj) involving advantage or good. Synonyms: positive. Example: "A plus (or positive) factor."