From Wiktionary
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  1. (uncountable) The space that something occupies.
  2. (countable & uncountable) Extension is the process of making something longer.
  3. (countable) An extension is the time or part of something that was added to make it longer.
    She had extensions put in her hair and now she has long hair.
    He couldn't pay in May so the bank gave him an extension until July.
  4. (countable & uncountable) An extension is the operation of pulling the two ends of a broken bone to bring the broken pieces into the same straight line.
  5. (countable & uncountable) Extension is the act of moving an arm, leg, finger, etc. so that it is straight.
  6. (countable & uncountable) An extension is short for file extension.


Related words[change]