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registration

noun [C] (CAR)
 
 
/ˌredʒ.ɪˈstreɪ.ʃən/ (also registration number, UK informal reg, US usually license plate number)

Definition

the official set of numbers and letters shown on the front and back of a road vehicle: Police are looking for a small blue car with the registration number B34-ACS.The exterior of vehicles
(Definition of registration noun (CAR) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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