From Longman Dictionary of Contemporary Englishserial numberˈserial ˌnumber noun [countable] HMNa number put on things that are produced in large quantities, so that each one has its own different number Each computer has a serial number on it.
Examples from the Corpus
serial number• They arrested me for having a gun with an altered serial number on it.• This register lists them by serial number, price, type of lathe, date sold and to whom.• Training returns, ammo expenditure, equipment serial number, vehicle mileage - all have to be documented.• The stolen weapon was identified by its serial number.• In addition, an AR-IS semiautomatic rifle with an obliterated serial number was found abandoned on the riverbank.• This is of course very easy since what the spreadsheet has stored in cells C and D is a time serial number.From Longman Business Dictionaryserial numberˈserial ˌnumber [countable]MANUFACTURING a number used on things that are produced in large quantities, making it possible to identify each oneAll of our guns have a unique serial number. → number 