noun
true discount
A financial term for the actual discount amount, as opposed to a nominal or advertised discount. Used in business and accounting contexts.
真割引率を計算するには、将来価値と現在価値の差を考慮する必要がある。
To calculate the true discount rate, you need to consider the difference between future value and present value.
Compound of 真 (しん, 'true') and 割引 (わりびき, 'discount'). The exact origin is uncertain, but it is a straightforward financial term.