From Longman Dictionary of Contemporary Englishcheck digitˈcheck ˌdigit noun [countable] technical the number on the far right of a bar code. It is used to check that the information on the bar code is correct.From Longman Business Dictionarycheck digitˈcheck ˌdigit COMPUTING a number or series of numbers added to the end of a code (=set of numbers or letters) to prevent a computer from making a mistakea unique 5-digit staff number followed by a check digit → digit
