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English definition of “deduction”

deduction

noun [C/U]  /dɪˈdʌk·ʃən/ us  
the process of learning something by considering a general set of facts and thinking about how something specific relates to them: [C] Sherlock Holmes was famous for making clever deductions.
an amount or part taken away from a total, esp. an expense that you do not have to pay taxes on, or the process of taking away an amount or part: [C] New tax regulations would cut the deduction for business lunches.
(Definition of deduction from the Cambridge Academic Content Dictionary © Cambridge University Press)
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