serial number
uk
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/ˈsɪə.ri.əl ˌnʌm.bər/us
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/ˈsɪr.i.əl ˌnʌm.bɚ/ noun one of a set of numbers that is put on things produced in large quantities, such as computers, televisions, paper money, etc. so that each has a different number and can be recognized