Etymology

extension

ex·ten·sion
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Today it means: The act of extending; a stretching out; enlargement in length, breadth, or time; an increase. Full definition →

Middle English extensioun ← Old French estension ← Latin extensiō, extensiōnem
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The story

  1. Latin · derived fromextensiō, extensiōnem
  2. Old French · derived fromestension
  3. Middle English · inherited fromextensioun
  4. English todayextension

From Middle English extensioun, from Old French estension, from Latin extensiō, extensiōnem.

Etymology from Wiktionary, CC BY-SA 4.0.