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Noun: postal order  'pow-st(u)l 'or-du(r)
Usage: Brit (N. Amer: money order)
  1. A written order for the payment of a sum to a named individual; obtainable and payable at a post office
    "He sent a postal order to pay for the items he purchased online";
    - money order

Derived forms: postal orders

Type of: bill of exchange, draft, order of payment

Encyclopedia: Postal order