Vacant
来自Big Physics
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Middle English: from Old French, or from Latin vacant- ‘remaining empty’, from the verb vacare .
wiktionary
From Old French vacant, from Latin vacans.
etymonline
vacant (adj.)
c. 1300, "not filled, held, or occupied," from Old French vacant "idle, unoccupied" (of an office, etc.), from Latin vacantem (nominative vacans), "empty, unoccupied," present participle of vacare "be empty" (from PIE *wak-, extended form of root *eue- "to leave, abandon, give out"). Meaning "characterized by absence of mental occupation" is from 1570s. Related: Vacantly.