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"simultaneous conflicting feelings," 1924 (1912 as ambivalency), from German Ambivalenz, coined 1910 by Swiss psychologist Eugen Bleuler (1857-1939) on model of German Equivalenz "equivalence," etc., from Latin ambi- "both" (see ambi-) + valentia "strength," from present participle of valere "be strong" (see valiant). A psychological term that by 1929 had taken on a broader literary and general sense.
ambivalence am·biv·a·lence (ām-bĭv'ə-ləns)
The coexistence of opposing attitudes or feelings toward a person, an object, or an idea.