Something that's occupied is being used or is unavailable. If the sign on the restroom door says occupied, it means there's someone in there and you're just going to have to wait.

If every seat on the subway is occupied, you'll have to stand, and if the apartment you were hoping to rent is occupied, you'll have to start your search all over again. When you're busy with work, you're occupied — you're engaged, or distracted by it. And when a country is occupied, it's been invaded and taken over by a foreign power — this last meaning was first used during World War II, referring to German-occupied France.

Definitions of occupied
  1. adjective
    held or filled or in use
    “she keeps her time well occupied
    “the wc is occupied
    busy, engaged, in use
    (of facilities such as telephones or lavatories) unavailable for use by anyone else or indicating unavailability; (`engaged' is a British term for a busy telephone line)
    (of time) taken up
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    not held or filled or in use
    not occupied or in use
    free, spare
    not taken up by scheduled activities
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  2. adjective
    resided in; having tenants
    “not all the occupied (or tenanted) apartments were well kept up”
    synonyms: tenanted
    having inhabitants; lived in
  3. adjective
    having one's attention or mind or energy engaged
    “she keeps herself fully occupied with volunteer activities”
    synonyms: engaged
    actively or fully engaged or occupied
  4. adjective
    seized and controlled as by military invasion
    “the occupied countries of Europe”
    see moresee less
    not seized and controlled
    that has been withdrawn or retreated from
    show more antonyms...
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