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noun [countable] sum pronunciation in British English /sʌm/ 
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singularsum
pluralsums
  1. 1
    an amount of money

    He was fined a sum of £1,000.

    a large/substantial/considerable/huge sum:

    Companies are prepared to pay substantial sums for the use of our facilities.

    a sum of money:

    We already spend large sums of money on advertising.

  2. 3
    a total amount made by adding several numbers or amounts together
    sum of:

    The total area was calculated as the sum of all the individual areas in the plan.

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