What's the poetic meaning of deciduous?
1570s, "a (social) moving, stirring, agitation," from Middle French émotion (16c.), from Old French emouvoir "stir up" (12c.), from Latin emovere "move out, remove, agitate," from ex- "out" (see ex-) + movere "to move" (see move (v.)). Sense of "strong feeling" is first recorded 1650s; extended to any feeling by 1808.
emotion e·mo·tion (ĭ-mō'shən)
An intense mental state that arises subjectively rather than through conscious effort and is often accompanied by physiological changes.