DEDUCTION Definition & Meaning

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deduction

[ dih-duhk-shuhn ]

Phonetic (Standard)IPA

noun

the act or process of deducting; subtraction.
something that is or may be deducted:
She took deductions for a home office and other business expenses from her taxes.
the act or process of deducing.
something that is deduced:
His astute deduction was worthy of Sherlock Holmes.
Logic.
1. 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.
2. a conclusion reached by this process. Compare induction ( def 4 ).

deduction

/ ��ɪˈ��ʌ��ʃə�� /

noun

the act or process of deducting or subtracting
something, esp a sum of money, that is or may be deducted
1. the process of reasoning typical of mathematics and logic, whose conclusions follow necessarily from their premises
2. an argument of this type
3. the conclusion of such an argument
logic
1. 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
2. an argument of this type Compare induction

deduction

/ ��ĭ-��ŭ��′��ə�� /

The process of reasoning from the general to the specific, in which a conclusion follows necessarily from the premises.
A conclusion reached by this process.

deduction

A cost or expense subtracted from revenue , usually for tax purposes.

deduction

A process of reasoning that moves from the general to the specific. ( Compare induction .)

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�y��vlog History and Origins

Origin of deduction¹

First recorded in 1400–50; late Middle English deduccioun, from Anglo-French, from Latin ��ŧ��ܳ��پ�ō��-, stem of ��ŧ��ܳ��پ�ō “a leading away”; deduct, -ion

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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.

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Example Sentences

First, she underrotated a back layout 1.5 into a front tuck on her final floor routine pass, almost falling to the floor in Maryland and securing a large score deduction.

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I thought there may be a silver lining with tax deductions.

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In March 2024, Nottingham Forest were teetering precariously above the Premier League relegation zone following a points deduction, and out of both domestic cup competitions.

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“Those savings can disappear quickly if you’re missing out on deductions or credits that a specialized accountant would catch,” Bennett said.

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If they are found guilty, they could face a massive points deduction or relegation.

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