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[dih-duhk-tiv] /dɪˈdʌk tɪv/
based on deduction from accepted premises, as in deductive argument; deductive reasoning.
Origin of deductive
First recorded in 1640-50, deductive is from the Latin word dēductīvus derivative. See deduct, -ive
Related forms
deductively, adverb
nondeductive, adjective
nondeductively, adverb
undeductive, adjective
undeductively, adverb
Usage note
Deductive and inductive refer to two distinct logical processes. Deductive reasoning is a logical process in which a conclusion drawn from a set of premises contains no more information than the premises taken collectively. All dogs are animals; this is a dog; therefore, this is an animal: The truth of the conclusion is dependent only on the method. All men are apes; this is a man; therefore, this is an ape: The conclusion is logically true, although the premise is absurd. Inductive reasoning is a logical process in which a conclusion is proposed that contains more information than the observations or experience on which it is based. Every crow ever seen was black; all crows are black: The truth of the conclusion is verifiable only in terms of future experience and certainty is attainable only if all possible instances have been examined. In the example, there is no certainty that a white crow will not be found tomorrow, although past experience would make such an occurrence seem unlikely. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for deductive
Historical Examples
  • The several steps of deductive Reasoning shall now be considered in turn as we proceed.

    The Art of Logical Thinking William Walker Atkinson
  • This form of reasoning is deductive, that is, it proceeds from the general to the particular.

    The Mind and Its Education George Herbert Betts
  • It furnishes us with the validity of the deductive inference or argument.

    The Art of Logical Thinking William Walker Atkinson
  • The deductive conclusion was confirmed and verified by experience.

  • But all the same, their deductive powers were far from perfect.

    Jan A. J. Dawson
  • You might be the longest-headed of deductive reasoners, and yet you might be beaten by your own pawns.

  • Certainly the great majority of deductive logicians have taken up some such attitude towards the process of discovery.

  • It's a home-run every time when you get your deductive theories unlimbered.

    The Man Upstairs P. G. Wodehouse
  • But these were dreams, frank dreams, fancied adventures of my deductive subconscious mind.

  • Had Annie needed confirmation of her deductive logic she had it.

    The One-Way Trail Ridgwell Cullum
British Dictionary definitions for deductive


of or relating to deduction: deductive reasoning
Derived Forms
deductively, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for deductive

1640s, from Latin deductivus, from deduct-, past participle stem of deducere "to deduce" (see deduce). Related: Deductively.

Online Etymology Dictionary, © 2010 Douglas Harper
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