This is the 14846th most frequent Polish word.
rejestracyjnym
"Rejestracyjnym" translates to "registration" or "register-related" in English, depending on context.
In this sentence, 'rejestracyjny' is used as an adjective to describe the 'numer' (number), indicating its association with registration.
Samochód posiada numer rejestracyjny.
The car has a registration number.
Here, 'rejestracyjną' (an inflected form of 'rejestracyjny') is used to modify 'tablicę' (plate), specifying that it concerns registration.
Sprawdzamy tablicę rejestracyjną pojazdu.
We are checking the vehicle's registration plate.
In this usage, 'rejestracyjnej' (another inflected form) functions as an adjective to describe 'opłaty' (fee), indicating its purpose or context of registration.