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The answers Dick provided were what came to my mind too. But it really depends on your connection to the university. Are you a student or a professor? Different terms would apply in each case. I (as a student) had to drop out for one semester just to get a temporary job and earn the tuition for my final semester. When I spoke with the Registrars Office about my intentions, they referred to what I was doing as a “temporary suspension of studies.” With my stated intention of returning, that made it easy to get started again and avoided a lot of redundant paperwork.