[1] : The Collaborative International Dictionary of English v.0.48

extension \exten"sion\, n. l. extensio: cf. f. extension. see
   extend, v. t.
   1. the act of extending or the state of being extended; a
      stretching out; enlargement in breadth or continuation of
      length; increase; augmentation; expansion.
      1913 webster

   2. physics that property of a body by which it occupies a
      portion of space.
      1913 webster

   3. logic  metaph.
      a capacity of a concept or general term to include a
          greater or smaller number of objects; -- correlative
          of intension.
      b the class or set of objects to which a term refers; --
          contrasted with intension, the logical specification
          which defines members of a class, being the set of
          attributes which are necessary and sufficient to
          recognize an object as a member of the class.
          1913 webster

                the law is that the intension of our knowledge
                is in the inverse ratio of its extension. --sir
                                                  w. hamilton.
          1913 webster

                the extension of the term plant is greater
                than that of geranium, because it includes more
                objects.                          --abp.
                                                  thomson.
          1913 webster

   4. surg. the operation of stretching a broken bone so as to
      bring the fragments into the same straight line.
      1913 webster

   5. physiol. the straightening of a limb, in distinction
      from flexion.
      1913 webster

   6. com. a written engagement on the part of a creditor,
      allowing a debtor further time to pay a debt.
      1913 webster

   counter extension. surg. see under counter.

   extension table, a table so constructed as to be readily
      extended or contracted in length.
      1913 webster
see also:
extend intension flexion counter extension counter extension table 

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