The term that defines the distance an object moves is "Displacement."
1. **Explanation:**
- Displacement refers to the change in position of an object from its initial point to its final point in a straight line.
- It considers both the magnitude (how far) and direction of the movement of the object.
- For example, if an object starts at point A and ends at point B, the displacement would be the straight-line distance and direction from A to B.
2. **Contrast with Velocity:**
- Velocity, on the other hand, represents the rate of change of displacement with respect to time. It includes both speed and direction of an object's movement.
In summary, while velocity includes the concept of speed and direction, displacement specifically refers to the distance an object moves from its initial point to its final point in a straight line.