plusa.[L., more; akin to Gr. , , and E. full. See Full, a., and cf. Pi, Pleonasm.]()1. (Math.) More, required to be added; positive, as distinguished from negative; -- opposed to minus.()2. Hence, in a literary sense, additional; real; actual.()Success goes invariably with a certain plus or positive power. (Emerson.)Plus sign (Math.), the sign (+) which denotes addition, or a positive quantity.()