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WordNet-Online
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Noun file name extension has 1 sense
- extension, filename extension, file name extension - a string of characters beginning with a period and followed by one to three 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"
--1 is a kind of string
--1 is a part of filename, file name, computer filename, computer file name
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