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recorded delivery UK US noun [U] UK (US certified mail) COMMUNICATIONS
► a service offered by the Post Office in the UK in which someone sending a letter or package receives an official piece of paper proving they have sent it, and the person who they are sending the letter or package to signs a paper to prove they have received it: send sth (by) recorded delivery »
Please send the policy documents back by recorded delivery.
Financial and business terms. 2012.