Below are possible answers for the crossword clue +.
3 letter answer(s) to +
AND
A particle which expresses the relation of connection or addition. It is used to conjoin a word with a word, a clause with a clause, or a sentence with a sentence.
4 letter answer(s) to +
PLUS
a useful or valuable quality
involving advantage or good; "a plus (or positive) factor"
on the positive side or higher end of a scale; "a plus value"; "temperature of plus 5 degrees"; "a grade of C plus"
the arithmetic operation of summing; calculating the sum of two or more numbers; "the summation of four and three gives seven"; "four plus three equals seven"