deduction Meaning in Cambridge American English Dictionary
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Meaning of "deduction" - American English Dictionary

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deductionnoun [C/U]

 us   /dɪˈdʌk·ʃən/
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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