Definition of: plus

(plus) prep.
1. Added to or to be added to: Three plus two equals five: opposed to minus.
2. Increased by: salary plus commission.
—adjective
1. Being or indicating more than nothing; above zero; positive.
2. Electrified positively.
3. Colloq. Possessing (something) in addition: used predicatively: He was plus a new hat.
4. Extra; supplemental: plus value.
5. Colloq. Denoting a value higher than ordinary in a specified grade: B plus.
6. Bot. Designating a form of sexual differentiation in certain plants: the plus strain of heterothallic fungi.
—noun plural plus·es
1. The plus sign.
2. An addition; an extra quantity.
3. A positive quantity.
4. Colloq. Something considered advantageous or desirable: a definite plus for the business.
—adverb Electr. Positively. [<L, more]