When you return, you go back somewhere after being away. If you haven't been to Disney World since your fifth birthday, it might be fun to return when you're older.
There are many ways to return — you can come back to a place, state, or activity, the way you return to jogging after getting a drink, or return to a feeling of sadness after brief cheer. You also might return something to someone else: "I need to return the book she loaned me," or "He returns her smile across the crowded room." A return can be a comment, a lobbed tennis ball, or even a financial profit.