American English

Definition of certified mail noun from the Oxford Advanced American Dictionary

 

certified mail

 noun
noun
 
[uncountable]
 
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a method of sending a letter or package in which the person sending it gets an official note to say it has been mailed and the person receiving it must sign a form when it is delivered I'd like to send this (by) certified mail. compare registered mail
See the Oxford Advanced Learner's Dictionary entry: certified mail