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Avoid these words. Seriously.

natural deduction

a system of formal logic that has no axioms but permits the assumption of premises of an argument. Such a system uses sequents to record which assumptions are operative at any stage Compare axiomatic (sense 3)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Examples from the Web for natural deduction
Historical Examples
  • I leave the natural deduction from these facts, to be made by the reader.

  • This would be the natural deduction to draw from the premise of evolution.

    The Saint Antonio Fogazzaro
  • Having once granted this, the natural deduction followed that if a girl was fit to rule at eighteen, a boy was fit to rule sooner.

    South America W. H. Koebel
  • The facts are those which have come under his personal observation: the inference is but a plain and natural deduction.

    The History of Prostitution William W. Sanger
  • Longman's eyebrows went up affirmatively, but he at once opposed the natural deduction from her observation.

    Comrade Yetta Albert Edwards
  • This was, indeed, the most natural deduction for Nick to arrive at, after considering all the circumstances.

    With Links of Steel

    Nicholas Carter
  • These premises, however colored, were logical enough in this—the natural deduction sprang out and greeted the eye.

    The Pace That Kills Edgar Saltus
  • The natural deduction from this is that the main settlement of the Antiphoner of the Mass fell within the same period.

  • No, sir; and, also based on the natural deduction because I adore mystery stories and it just doesn't make any sense.

    Warren Commission (9 of 26): Hearings Vol. IX (of 15) The President's Commission on the Assassination of President Kennedy

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