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unoccupied (adj.)
[unoccupied 词源字典]
late 14c., "idle," from
un-
(1) "not" + past participle of
occupy
(v.). In reference to ground, etc., "not possessed, not made use of," from early 15c.
[unoccupied etymology, unoccupied origin, 英语词源]
[unoccupied 词源字典]