Definition of file extension in English:

file extension

Syllabification: file ex·ten·sion

noun

Computing
  • A group of letters occurring after a period in a file name, indicating the format of the file.
    More example sentences
    • This is done by viewing the file extension in the email attachment.
    • The protocol name is simply the filename, excluding any file extension.
    • Have you ever gotten an e-mail from a friend with a file extension you may not be familiar with?

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Word of the day tortie
Pronunciation: ˈtôrtē
noun
a tortoiseshell cat