Collins COBUILD Advanced Learner's English Dictionary - plus sign

(plus signs) A plus sign is the sign + which is put between two numbers in order to show that the second number is being added to the first. It can also be put before a number to show that the number is greater than zero (+3), and after a number to indicate a number that is more than a minimum number or amount (18+). N-COUNT PLUS-FOURS also plus fours Plus-fours are short wide trousers fastened below the knees which people used to wear when hunting or playing golf. (OLD-FASHIONED) N-PLURAL: also a pair of N