The term 'pay in advance' can be summarized by two crossword solutions: PREPAY (6 letters) and ANTE (4 letters). PREPAY is a verb meaning to pay for something before receiving it or before it is due. ANTE is a noun meaning an amount of money that must be paid or risked in order to begin a game or enter a business transaction. Both words refer to the concept of paying for something before it is due, which is the definition of 'pay in advance'.