Definition of "registration number" []

• The number on the license plate that identifies the car that bears it (noun)

WordNet. Princeton University. 2010.

• "The name, address, phone number, and boat registration number he gave to Portland Yacht Services, administrators of the marina, were all false."
• ""I mean, unidentified vessel, this is the _Rattle and Hum, _ Martian registration number 5538-A47D."
• "Rafe found the right controls and the IDs came up — each craft’s registration number first, and then its type."