deduction

noun6

1. •
   That which is deducted; that which is subtracted or removed.
2. •
   A sum that can be removed in tax calculations, usually from the taxable amount; something that is written off.

   • You might want to donate the old junk and just take the deduction.
3. •
   A sum withheld from an employee's pay for the purpose of paying tax.
4. •
   The ability or skill to deduce or figure out; the power of reason

   • Through his powers of deduction, he realized that the plan would never work.
5. •
   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.
6. •
   A conclusion; that which is deduced, concluded or figured out.

   • He arrived at the deduction that the butler didn't do it.