What is the X in X-mas?
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.