Definition of file extension in English:

file extension

Line breaks: file ex¦ten|sion

noun

Computing
  • A string of characters attached to a filename, usually preceded by a full stop and 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 coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody