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English definition of “sender”

sender

noun [C] uk   /ˈsen.dər/ us    /-dɚ/
a person who sends something: Postage stamps were introduced in Britain in 1840 as a way of showing that the sender had paid for the letter to be delivered. The letter came back with 'return to sender - not known at this address' written on it.Messengers and people who deliver things
(Definition of sender from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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