From Longman Dictionary of Contemporary Englishmoney orderˈmoney ˌorder noun [countable] BFBTCMan official document that you buy in a post office or a bank and send to someone so that they can exchange it for money in a bank → postal order
Examples from the Corpus
money order• Otherwise, send the embassy your application, two photos, your passport and a $ 65 money order.• I went to the telegraph office of the railroad for my money order from New York.• Payment must be by check or money order.• And the money order number is two five four, eight six one.• That was why once or twice Debbie let her cash the money order for her.From Longman Business Dictionarymoney orderˈmoney ˌorder noun [countable]FINANCE a document bought at a bank or post office which can be sent through the post and exchanged for money 