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See also: co-extensive


Alternative forms[edit]


From co- +‎ extensive.


  • (UK) IPA(key): /ˌkəʊ.ɪkˈstɛn.sɪv/
  • (US) IPA(key): /ˌkoʊ.ɛkˈstɛn.sɪv/


coextensive (not comparable)

  1. Having the same spatial limits or boundaries; sharing the same area.
    The city and county of San Francisco are coextensive.
  2. Occurring over the same period of time; contemporaneous.
    • 1946, Bertrand Russell, History of Western Philosophy, I.30:
      His life is almost co-extensive with one of the most disastrous periods in Roman history.
  3. (logic) Having the same extension—the object or set of objects to which a term refers.
    • 1995, Jaegwon Kim, Ernest Sosa, A Companion to Metaphysics[1]:
      Coextensive expressions with different intensions cannot in general be substituted for one another within an expression e while preserving the extension of e (assuming that the extension of a declarative sentence is its truth value).

Related terms[edit]