Picture a line drawn around a place, with the people who actually live inside it on one side. A non-resident is anyone standing on the other side of that line — they may own a flat inside it, eat there, or come back every year, but they are counted as living somewhere else. The line is about living, not about belonging, and that is why it can be drawn around a country or around a single hotel.
From the word’s history
Wiktionary records the word as non- + resident, and resident comes from reside, to live somewhere. So the word has always been about where a person lives, not about where they come from.
來源資料記錄這個字是 non- 加上 resident，而 resident 又來自 reside（居住）。所以這個字從組成上看，講的一直是「住在哪裡」這件事，跟出身或國籍沒有關係。這正好解釋了為什麼一個本國公民長住國外之後，也會被算成 non-resident。
Wiktionary, "non-resident"
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