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chair

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noun American English pronunciation: chair /tʃer/ 
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singularchair
pluralchairs
  1. 1
    [countable] a piece of furniture for one person to sit on, with a back, legs, and sometimes two arms

    I had to sit on a hard wooden chair all day.

  2. 2
    [countable] the person who is in charge of a meeting, committee, or company

    All questions must be addressed to the chair.

    chair of:

    He is the former chair of the Atomic Energy Commission.

  3. 3
    the position or job of being a professor in a university

    He held the Einstein Chair of Physics at Princeton for 30 years.

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