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file name extension is a noun meaning "a string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename". It carries one recorded sense.
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”
Definitions, synonyms and semantic relations for file name extension come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.