Definition of postal order noun from the Oxford Advanced Learner's Dictionary

 

postal order

 noun
noun
BrE BrE//ˈpəʊstl ɔːdə(r)//
 
; NAmE NAmE//ˈpoʊstl ɔːrdər//
 
(British English)(also money order North American English, British English)(abbreviation PO)
 
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an official document that you can buy at a bank or a post office and send to somebody so that they can exchange it for money

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