noun

1. An amount of time or a particular time interval.

2. (in the singular, not followed by "of") The time taken for the current situation to end, especially the current war

   “Rationing will last at least for the duration.”

3. A measure of the sensitivity of the price of a financial asset to changes in interest rates, computed for a simple bond as a weighted average of the maturities of the interest and principal payments associated with it.