"Duration" Confusion

SS9 Is it just me or the word “Duration” is used many times to mean either “sensitivity of parallel shift in yield curve on portfolio value” or to just mean “period of time”. Another way to phrase my question is; do I have to think of a traditional definition of Duration (“sensitivity of parallel shift in yield curve on portfolio value”) everytime it is used or I can think of it as a period of time?

Personally, I would interpret Duration as sensitivity to interest rate changes.