Definition of "Motion" :

noun: the act of changing location from one place to another

"Police controlled the motion of the crowd."

noun: a change of position that does not entail a change of location

"The reflex motion of his eyebrows revealed his surprise."

noun: the use of movements (especially of the hands) to communicate familiar or prearranged signals

noun: a formal proposal for action made to a deliberative assembly for discussion and vote

"He made a motion to adjourn."

noun: a natural event that involves a change in the position or location of something

noun: an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object

"The cinema relies on apparent motion."

noun: a state of change

"They were in a state of steady motion."

verb: show, express or direct through movement