MOTION

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

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

A change of position that does not entail a change of location

Example: "The reflex motion of his eyebrows revealed his surprise"

A state of change

Example: "They were in a state of steady motion"

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

Example: "He made a motion to adjourn"

The act of changing location from one place to another

Example: "Police controlled the motion of the crowd"

An optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object

Example: "The cinema relies on apparent motion"