- to take away, as from a sum or amount: Once you deduct your expenses, there is nothing left.
- detract; abate (usually followed by from): The rocky soil deducts from the value of his property.
Origin of deduct
- (tr) to take away or subtract (a number, quantity, part, etc)income tax is deducted from one's wages
Word Origin and History for undeducted
early 15c., from Latin deductus, past participle of deducere "lead down, bring away;" see deduce, with which it formerly was interchangeable. Technically, deduct refers to taking away portions or amounts; subtract to taking away numbers. Related: Deducted; deducting.