deduction
n. countable B2 Upper Intermediate US //dɪˈdəkʃən// UK //dɪdˈʌkʃən// de·duc·tion
n. an amount taken away from a total, especially from your income or a bill. You also use it to describe a logical conclusion based on evidence.
n. an amount subtracted from a total sum, particularly in taxation or accounting; a conclusion reached by reasoning from specific facts to a general truth.
The tax deduction lowered his final bill.
She claimed a deduction for her home office expenses on the annual return.
The detective relied on careful deduction rather than guesswork to identify the suspect from the scattered clues.
From Middle French déduction, from Latin deductio. Equivalent to deduct + -ion or deduce + -tion.