1. (noun) A form of logical reasoning that derives a conclusion from a set of premises and the conclusion cannot be false if the premises are true.

2. (noun) Moving from the general to the particular.


  1. All words have definitions. Deduction is a word. Therefore, deduction has a definition.
  2. Rain is wet. It is raining outside. It is wet outside.

Audio Pronunciation: (de·duc·tion)

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Usage Notes:

  • Plural: deductions
  • Deduction begins with theory, moves to hypothesis, then to prediction, and finally to testing and observation.
  • Deduction is the traditional logic used in scientific research as outlined by the scientific method.
  • The hypothetico-deductive model refers to the process of deduction used as research method.
  • An argument derived through deduction is called a syllogism.
  • Deduction is the opposite of induction.
  • A type of reductionism.
  • Also called:
    • deductive logic
    • deductive reasoning
    • synthesis
  • Sociologists use deduction to determine the logic of their theoretical arguments.
  • A (noun) deductionist (verb) deduces (adjective) deductive or (adjective) deductional theories (adverb) deductionally.

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