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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.

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. 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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