addition

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Concise Oxford English Dictionary © 2008 Oxford University Press:
addition/əˈdɪʃn/
noun
  • 1 the action or process of adding.

    ■ a person or thing added.

  • 2 the process of adding numbers or amounts.

    Mathematics the process of combining matrices, vectors, or other quantities under specific rules to obtain their sum or resultant.

'addition' also found in these Oxford entries:

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