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?

Definition of file extension in:

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Pronunciation: ɪnˈvɛnəm
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put poison on or into; make poisonous