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    ex·ten·sion
    [ikˈsten(t)SH(ə)n, ekˈsten(t)SH(ə)n]
    noun
    extension (noun) · extensions (plural noun) · extension cable (noun) · extension cables (plural noun) · extension lead (noun) · extension leads (plural noun) · extension cord (noun) · extension cords (plural noun)
    1. a part that is added to something to enlarge or prolong it; a continuation:
      "the railroad's southern extension"
      Image of extension
      Image of extension
      Image of extension
      Image of extension
    2. a length of electric cord that permits the use of an appliance at some distance from a fixed socket.
    3. an extra telephone on the same line as the main one:
      "you can listen on the extension in the bedroom"
      • a subsidiary telephone in a set of offices or similar building, on a line leading from the main switchboard but having its own additional number:
        "contact Liz McDonald on extension 3514"
    4. the action of moving a limb from a bent to a straight position:
      "seizures with sudden rigid extension of the limbs"
      • ballet
        the ability of a dancer to raise one leg above their waist, especially to the side:
        "she has amazing extension" · "he could perform 180-degree extensions"
      • medicine
        the application of traction to a fractured or dislocated limb or to an injured or diseased spinal column to restore it to its normal position.
      • the lengthening of a horse's stride within a particular gait.
    5. instruction by a university or college for students who do not attend full time:
      "extension courses"
    6. logic
      the range of a term or concept as measured by the objects that it denotes or contains, as opposed to its internal content. Often contrasted with intension
    7. physics
      philosophy
      the property of occupying space; spatial magnitude:
      "nature, for Descartes, was pure extension in space"
    Origin
    late Middle English: from late Latin extensio(n-), from extendere ‘stretch out’ (see extend).
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