1.NounThat which is deducted; that which is subtracted or removed.
"standard deduction; You might want to donate the old junk and just take the deduction."
2.NounA sum that can be removed in tax calculations, usually from the taxable amount; something that is written off.
"standard deduction; You might want to donate the old junk and just take the deduction."
3.NounA sum withheld from an employee's pay for the purpose of paying tax.
4.NounA 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.
"He arrived at the deduction that the butler didn't do it.; Through his powers of deduction, he realized that the plan would never work."
5.NounA conclusion; that which is deduced, concluded or figured out.
"He arrived at the deduction that the butler didn't do it."
6.NounThe 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."