Meanings
Synonyms & antonyms
nounSynonym of file extension.
Similar
More synonyms by meaning
nouna string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename
Similar
extensionfile name extension
Broader
Also see
Synonym sets from Open English WordNet, CC BY 4.0.
Cite this entry
APA
filename extension. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/filename%20extension
MLA
“filename extension.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/filename%20extension. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “filename extension,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/filename%20extension.
Source: filename extension on Wiktionary, CC BY-SA 4.0.