The action of deducting or subtracting something. The deduction of taxes from his salary left him with less money than expected.
An amount that is or may be deducted from something, especially from taxable income or tax to be paid. He claimed a deduction for his business expenses on his tax return.
The inference of particular instances by reference to a general law or principle. Sherlock Holmes was famous for his skill in deduction, solving mysteries with logical reasoning.
A conclusion or judgement reached by deductive reasoning. Her deduction that the letter was a forgery proved correct.