A person or organization that places money or valuables with a bank or other institution for safekeeping.
From 'deposit' + '-or' meaning 'one who does.' The word became standard in English during the development of modern banking in the 17th-18th centuries.
Banks depend on depositors trusting them with their money—the more depositors a bank has, the more money it has to lend out and make profit from, so banks spend billions advertising why you should deposit with them.
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