What is Plus?

Plus definition and meaning on Dictionary terms:
more by the addition of; increased by: ten plus two is twelve.
with the addition of; with: He had wealth plus fame.

involving or noting addition.
positive: a plus quantity.

more (by a certain amount).
Electricity. pertaining to or characterized by positive electricity: the plus terminal.
Mycology. (in heterothallic fungi) designating, in the absence of morphological differentiation, one of the two strains of mycelia that unite in the sexual process.
having a certain quality to an unusual degree: He has personality plus.

noun, plural plus