The term in physical science that defines a change in position is motion.

Here's why:

* Motion describes an object's change in position over time relative to a reference point. This change can be in any direction and at any speed.

* Displacement refers to the overall change in position from the starting point to the ending point, regardless of the path taken.

* Velocity combines both speed and direction, indicating how fast an object is moving and in what direction.

So, while displacement and velocity are related to motion, the most general term for a change in position in physical science is motion.