certified mail
noun/ˌsɜːtɪfaɪd ˈmeɪl/
/ˌsɜːrtɪfaɪd ˈmeɪl/
(North American English) (British English recorded delivery)
[uncountable]- a method of sending a letter or package in which the person sending it gets an official note to say it has been posted and the person receiving it must sign a form when it is delivered compare registered mail
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certified mail