D defs.my
Entry 2 senses Webster, 1913

Leitmotif

/(līt"mō̇*tē̇f")/ · Leit·mo·tif · IPA /ˈlaɪt.moʊˌtif/
01 n. a guiding theme; in Wagnerian opera, a marked melodic phrase or short musical passage which always accompanies the reappearance of a certai…
  1. 1.
    a guiding theme; in Wagnerian opera, a marked melodic phrase or short musical passage which always accompanies the reappearance of a certain person, situation, abstract idea, or allusion in the course of the play; a sort of musical label. Also called Leading motive.(Mus.)
  2. 2.
    a recurring theme in the activities of a person or group.