For a bond, the Modified Duration result measures the percentage relative change in a bond’s price per a 1% increase in bond yield.
For a loan, the result measures the percentage relative change in a loan’s price per a 1% increase in the yield curve. In the Single Option page this result is called Duration; in the Portfolio page it is called Modified Duration.
For a vanilla swap, general swap, cross currency swap, overnight index swap, zero coupon swap:
This result is the weighted average time to maturity of the leg cash flow. It is stated in years. It measures the percentage relative change in the leg value per an increase of 1% in the market interest rates, taking into account the notional exchange on the start date and the end date.
In the Single Option page this result is called Duration, and is displayed for each leg individually and as a total; in the Portfolio page it is called Modified Duration and only displayed as a total.