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