Definition of "deduction"

That which is deducted; that which is subtracted or removed

1. A sum that can be removed from tax calculations; something that is written off  examples

2. (law, finance) A sum withheld from an employee's pay for the purpose of paying tax.  examples

(logic) A process of reasoning that moves from the general to the specific, in which a conclusion follows necessarily from the premises presented, so that the conclusion cannot be false if the premises are true.

1. A conclusion; that which is deduced, concluded or figured out  quotations  examples

   Quotations

   • An unkinder deduction, considering only the Select Committee's report and discounting rumours of wayward conclusions by the Stedeford Group, would be that if one inquisition doesn't produce the desired answers, the Minister's policy is "try, try again"—or should one say "fight, fight, fight again".

     1961 January, “Talking of Trains: Marples out of step”, in Trains Illustrated, page 1

2. The ability or skill to deduce or figure out; the power of reason  examples