Origin: Latin suffix -tion
Deduction has 7 different meanings across 1 category:
a reduction in the gross amount on which a tax is calculated; reduces taxes by the percentage fixed for the taxpayer's income bracket
"The accountant applied a standard deduction to lower his taxable income before calculating the final tax bill."
something that is inferred (deduced or entailed or implied)
"his resignation had political implications"
reasoning from the general to the particular (or from cause to effect)
"The detective used a logical deduction to conclude that the thief must have entered through the broken window based on the muddy footprints."
the act of subtracting (removing a part from the whole)
"he complained about the subtraction of money from their paychecks"
the act of reducing the selling price of merchandise
"The store offered a deduction on all winter coats to clear out the seasonal inventory before spring arrived."
That which is deducted; that which is subtracted or removed
"The tax deduction reduced her annual income by several thousand dollars."
In plain English: Deduction is figuring out an answer by using facts you already know to reach a logical conclusion.
"The detective made a quick deduction that the thief had fled through the back window based on the muddy footprints."
Usage: In everyday contexts, deduction refers to an amount taken out of money, such as taxes withheld from a paycheck. Do not confuse this with the logical process of drawing conclusions from evidence, which uses the same spelling but has a different meaning entirely.
From Middle French déduction, from Latin deductio. Equivalent to deduct + -ion or deduce + -tion.