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Noun: subtraction  sub'trak-shun
  1. An arithmetic operation in which the difference between two numbers is calculated
    "the subtraction of three from four leaves one";
    - minus
  2. The act of subtracting (removing a part from the whole)
    "he complained about the subtraction of money from their paychecks";
    - deduction

Derived forms: subtractions

Type of: arithmetic operation, decrease, diminution, reduction, step-down

Antonym: addition

Encyclopedia: Subtraction