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addition

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noun American English pronunciation: addition /əˈdɪʃ(ə)n/ 
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singularaddition
pluraladditions

Related dictionary definitions

  1. 1
    [countable] something that you add to something else
    addition to:

    The latest addition to her business empire is a chain of clothing stores.

    New additions to the library include reading lamps and comfortable chairs.

    This program is a useful addition to their range of business-related software.

    1. a.
      [uncountable] the action of adding something to something else

      The addition of a few drops of lavender oil to your bath water aids relaxation.

  2. 2
    [uncountable] math the process of adding two or more numbers or amounts together to make a total

    Lesley is teaching the children addition and subtraction.

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