/ dɪˈdʌkʃn; NAmE / noun
1.
[ U , C ] the process of using information you have in order to understand a particular situation or to find the answer to a problem :
He arrived at the solution by a simple process of deduction.
If my deductions are correct, I can tell you who the killer was.
—see also deduce
—compare induction (3)
2.
[ U , C ] the process of taking an amount of sth, especially money, away from a total; the amount that is taken away :
deductions from your pay for tax, etc.
tax deductions
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WORD ORIGIN
late Middle English : from Latin deductio(n-) , from the verb deducere , from de- down + ducere lead.