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(1)   The act of subtracting (removing a part from the whole)
"He complained about the subtraction of money from their paychecks"
(2)   The act of reducing the selling price of merchandise
(3)   Reasoning from the general to the particular (or from cause to effect)
(4)   Something that is inferred (deduced or entailed or implied)
"His resignation had political implications"
(5)   An amount or percentage deducted
(6)   A reduction in the gross amount on which a tax is calculated; reduces taxes by the percentage fixed for the taxpayer's income bracket


  1. that which is deducted; that which is subtracted or removed
  2. a sum that can be removed from tax calculations; something that is written off
    You might want to donate the old junk and just take the deduction.
  3. a conclusion; that which is deduced, concluded or figured out
    He arrived at the deduction that the butler didn't do it.
  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. 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.
    b. a conclusion reached by this process