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1520s, from Middle French imminent (14c.) and directly from Latin imminentem (nominative imminens), present participle of imminere "to overhang; impend, be near, be at hand," from assimilated form of in- "into, in, on, upon" (see in- (2)) + minere "jut out," related to mons "hill" (see mount (n.)). Related: Imminently.