Meaning of “registration” - Learner’s Dictionary

registration

noun uk us /ˌredʒɪˈstreɪʃən/
OFFICIAL LIST [ U ]

B1 the recording of a name or information on an official list

VEHICLE [ C ] (also registration number, uk us ) mainly UK

the official set of numbers and letters on the front and back of a vehicle:

a car with the registration M148 VVH

(Definition of “registration” from the Cambridge Learner’s Dictionary © Cambridge University Press)