Personally, I've never seen The World symbolizing unfulfilled completion. Usually, it surfaces for the following reasons:
1. The cards are telling me: "What's the problem? Things are more well-rounded than you're apparently realizing. Sky's the limit, and all that jazz."
2. If I'm asking about a person, The World is generally telling me: "This person is currently dealing with matters that extend above and beyond your influence. Let them deal with that."
3. "This matter is in the hands of the Universe, not you." (This primarily surfaces when I'm using the Thoth deck.)
Chances are, if the circumstance doesn't feel completed, it probably isn't. But keep in mind: This is only my personal experience -- mileage may vary.
(Tangentially, this card additionally surfaced when I was involved with somebody from another country. It was also produced when political problems were unfurling in my native country. But that's not the typical manifestation of The World in general spreads, so.
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