The action of subtracting an amount of money or value, or the process of using logic to reach a conclusion.
Present participle of 'deduct,' from Latin 'deducere' (to lead down). In medieval English, this word specifically meant 'to subtract' in mathematical contexts before broadening to mean logical inference.
Medieval accountants and philosophers used 'deducting' for completely different purposes—one was literally subtracting on an abacus, the other was reasoning about metaphysics—yet both actions came from the same Latin word about 'leading down.'
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