Extension
来自Big Physics
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late Middle English: from late Latin extensio(n- ), from extendere ‘stretch out’ (see extend).
wiktionary
From Middle English extensioun, from Old French estension, from Latin extensiō, extensiōnem.
etymonline
extension (n.)
c. 1400, "swelling, bulging," from Latin extensionem/extentionem (nominative extensio/extentio) "a stretching out, extension," noun of action from past-participle stem of extendere (see extend). In a concrete sense, "extended portion of something" (a railroad, etc.), from 1852. Telephone sense is from 1906.
