Englishfor English speakers
registered
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adjective
(of a boat or vessel) furnished with necessary official documents specifying ownership etc
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adjective
listed or recorded officially
record is made of 'registered mail' at each point on its route to assure safe delivery
registered bonds
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adjective
(of animals) officially recorded with or certified by a recognized breed association; especially in a stud book
a registered Percheron
user
Noun
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A user is someone who uses something.
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A user is someone with an account and username that lets them log in to a computer and do things on the computer.