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English definition of “register”

register

verb [T] (MAIL)    /ˈredʒ.ɪ.stər/ US  /-stɚ/
If you register a letter or parcel, you send it using a special postal service, so that it will be dealt with in a special way and not be lost: a registered letterDelivering and despatching
(Definition of register verb (MAIL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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