What is the X in X-mas?
late 14c., from Old French movement "movement, exercise; start, instigation" (Modern French mouvement), from Medieval Latin movimentum, from Latin movere (see move (v.)). In the musical sense of "major division of a piece" it is attested from 1776; in the political/social sense, from 1828. Related: Movements.
movement move·ment (mōōv'mənt)
The act or an instance of moving; a change in place or position.
An evacuation of the bowels; defecation.
In music, a self-contained division of a long work; each movement usually has its own tempo. A long, undivided composition is said to be in one movement.