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English definition of “deduction”

deduction

noun [C or U] uk   /dɪˈdʌk.ʃən/ us  

deduction noun [C or U] (THINKING)

C2 the process of reaching a decision or answer by thinking about the known facts, or the decision that is reached: Through a process of deduction, the detectives discovered the identity of the killer. All we can do is make deductions from the available facts.Concluding and deducing

deduction noun [C or U] (TAKING AWAY)

C1 the calculation of taking an amount or a part of something away from a total, or the amount that is taken away: The interest I receive on my savings account is paid after the deduction of tax. After deductions (= expenses on which tax does not have to be paid), his taxable income is $30,000.Value and price decreasesAddition, subtraction, multiplication and divisionCalculations and calculating US and Australian English an amount that is taken away from the money you are paid before you officially receive it
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(Definition of deduction from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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