The registration number or the registration of a car or other road vehicle is the series of letters and numbers that are shown at the front and back of it.
[British]
Another driver managed to get the registration number of the car.
regional note: in AM, use license number
registration number in British English
noun
a sequence of letters and numbers assigned to a motor vehicle when it is registered, usually indicating the year and place of registration, displayed on numberplates at the front and rear of the vehicle, and by which the vehicle may be identified
Examples of 'registration number' in a sentence
registration number
He had signed in as John Braybrooke - but as Kenworthy had forecast, had entered the correct registration number of the hired car.
Hilton, John Buxton THE INNOCENTS AT HOME (A SUPERINTENDENT KENWORTHY NOVEL) (2002)
The other even remembered the registration number in case she saw it later on.