The term 'bank posting' refers to the process of entering financial transactions into a bank's accounting system. The two crossword solutions for this term are 'RATE' and 'rates'. RATE is a four-letter word meaning the amount of money charged or paid for something, such as interest on a loan. Rates is a five-letter word meaning the same thing, but in the plural form. Bank posting involves entering these rates into the bank's accounting system so that the bank can accurately track its financial transactions.