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extension

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noun American English pronunciation: extension /ɪkˈstenʃ(ə)n/ 
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singularextension
pluralextensions
  1. 1
    [countable] extra time that you are given to finish a piece of work, especially at college
    extension on:

    I'm going to ask for an extension on this paper.

    1. a.
      extra time that you are given to pay money that you owe
      extension on:

      Will the bank give you an extension on the loan?

    2. b.
      extra time that you are given to use a particular legal document or right

      a visa extension

      extension to:

      Brady wants a two-year extension to his contract.

  2. 2
    [countable] a telephone line that is one of several lines coming from a main line

    What's your extension?

    I'm at extension 334.

    a new extension number

  3. 3
    [countable] an extra room or rooms added to a building

    The company is building an extension onto the side of the factory.

    extension to:

    He has applied for permission to build a single-story extension to his house.

  4. 5
    [countable] something that develops from a particular custom, activity, idea, etc.
    extension of:

    Business entertainment seems a natural extension of Japan's gift-giving culture.

    He sees local history as an extension of family history.

  5. 6
    [uncountable] formal the action of stretching part of your body

    His leg was now capable of full extension.

  6. 7
    [singular/uncountable] an increase in the power of something
    extension of:

    the further extension of state control

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major on (doing) sth

to have or do a lot of something; to focus on a particular thing

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