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|Noun||1.||filename extension - a string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename; "most applications provide extensions for the files they create"; "most BASIC files use the filename extension .BAS"|
computer file name, computer filename, file name, filename - (computer science) the name given to a computer file in order to distinguish it from other files; may contain an extension that indicates the type of file
string - a linear sequence of symbols (characters or words or phrases)