These purposes might differ significantly and may change over time.

But if the library is here to stay, its purpose has radically changed.

The purpose of the fort changed multiple times throughout its history.

The stated purpose of the magazine has changed over time.

My goal and purpose, though they've shifted, have not changed.

Since then, both the name and the purpose have changed significantly.

Neither she nor Jackson seemed to realize the purpose of their lives had changed.

Or that purpose changed one day and I wasn't informed.

The purpose of having so many statues has changed over time.

The purpose of the report has not changed since then.