1 something that you work out from facts that you already know; the ability to think in this way 推断出的结论；演绎法: It was a brilliant piece of deduction by the detective. 那侦探真聪明，能够推断出这个结论。 ☞verb deduce 动词为deduce ☞Compare induction (2). 与induction(2)比较。

2 deduction (from sth) taking away an amount or number from a total; the amount or number taken away from the total 扣除；扣除额: What is your total income after deductions? (= when tax, insurance, etc are taken away) 扣除税款、保险金等各项费用后，你的总收入是多少？ ☞verb deduct 动词为deduct