plus (Adjective) — On the positive side or higher end of a scale. ex. "a plus value" ex. "temperature of plus 5 degrees" ex. "a grade of C plus"
plus (Adjective) — Involving advantage or good. ex. "a plus factor"
plus (Noun) — A useful or valuable quality.
plus (Noun) — The arithmetic operation of summing; calculating the sum of two or more numbers. ex. "four plus three equals seven"
plus (Noun) — A sign indicating the operation of addition.
plus (Preposition) — With the addition of; increased by. ex. "one plus one is two"
plus (Conjunction) — And also; in addition. ex. "Let's go home now, it's late, plus I'm not feeling too well."