registracija

1. registration; sign-up
   Registracija na sajtu traje samo dva minuta. — Signing up on the website takes only two minutes.
   Završio sam registraciju firme u APR-u. — I finished registering the company with the Business Registers Agency.
2. (of a vehicle) vehicle registration; license plates
   Moram da produžim registraciju pre kraja meseca. — I have to renew my car registration before the end of the month.
   Ispred zgrade je parkiran auto sa stranom registracijom. — A car with foreign plates is parked in front of the building.

In Serbia cars are re-registered every year, so istekla mi je registracija (my registration has expired) is a very common phrase.