Motion is an absolute term.
Motion:
Motion is the process of moving, changing place, or even changing the position of an object relative to an observer in a given interval of time.
Example: Imagine we are traveling in a bus, for a passenger sitting with us inside the bus - we are at rest.
for a person by the road, who is observing the bus - we are in motion.
Hence, motion is a relative term, not an absolute term.