- a process of reasoning in which a conclusion follows necessarily from the premises presented, so that the conclusion cannot be false if the premises are true.
- a conclusion reached by this process.Compare induction(def 4).
Origin of deduction
Related Words for deductiondiscount, abatement, rebate, credit, reduction, allowance, write-off, inference, deliberation, result, meditation, reasoning, thinking, ratiocination, rumination, assumption, answer, finding, corollary, musing
Examples from the Web for deduction
Contemporary Examples of deduction
True, making an Item 24 deduction requires me to “Attach Form 2106.”Up to a Point: I Do My Own Taxes With No Help, Except From a Couple of Bloody Marys
P. J. O’Rourke
April 15, 2014
But it would represent a deduction of nearly 20 percent from fiscal 2012.The Sequester Is Proof that Washington Thinks We Are All Idiots
March 14, 2013
Master of deduction Sherlock refuses to put together the evidence that his girlfriend Alyssa is cheating on him.This Week’s Hot Reads: Jan. 28, 2013
Mythili Rao, David Goodwillie
January 29, 2013
National Review's editors would rather end the deduction for state and local taxes than increase rates.End the Deduction for State and Local Taxes
December 14, 2012
The deduction for state and local taxes does not much interest Texans.The Fiscal Cliff's Upper Class Battle
December 4, 2012
Historical Examples of deduction
Intellectually I may make mistakes in deduction, but spiritually I cannot but find God.The Conquest of Fear
I'll give about eight thousand with a deduction on account of the glades.Master and Man
His art is less for every deduction from his holiness, and less for every defect of common sense.Essays, First Series
Ralph Waldo Emerson
That is not a matter of opinion, not a matter of inference or deduction.The Life of Cesare Borgia
My deduction is that those signals did not and could not cause the explosion.The Destroyer
Burton Egbert Stevenson
- the process of reasoning typical of mathematics and logic, whose conclusions follow necessarily from their premises
- an argument of this type
- the conclusion of such an argument
- a systematic method of deriving conclusions that cannot be false when the premises are true, esp one amenable to formalization and study by the science of logic
- an argument of this typeCompare induction (def. 4)
early 15c., "action of deducting," from Middle French déduction or directly from Latin deductionem (nominative deductio), noun of action from past participle stem of deducere (see deduce). Meaning "that which is deducted" is from 1540s. As a term in logic, from Late Latin use of deductio as a loan-translation of Greek apagoge.
Usage: The logical processes known as deduction and induction work in opposite ways. In deduction general principles are applied to specific instances. Thus, using a mathematical formula to figure the volume of air that can be contained in a gymnasium is applying deduction. Similarly, applying a law of physics to predict the outcome of an experiment is reasoning by deduction. By contrast, induction makes generalizations based on a number of specific instances. The observation of hundreds of examples in which a certain chemical kills plants might prompt the inductive conclusion that the chemical is toxic to all plants. Inductive generalizations are often revised as more examples are studied and more facts are known. If certain plants that have not been tested turn out to be unaffected by the chemical, the conclusion about the chemical's toxicity must be revised or restricted. In this way, an inductive generalization is much like a hypothesis.
A process of reasoning that moves from the general to the specific. (Compare induction.)
A cost or expense subtracted from revenue, usually for tax purposes.