The term that describes both the speed and direction of motion is velocity.

Here's why:

* Speed tells you how fast something is moving, but doesn't tell you where it's going.

* Direction tells you where something is moving, but doesn't tell you how fast.

Velocity combines both speed and direction. For example:

* Speed: 50 miles per hour

* Direction: North

* Velocity: 50 miles per hour North

Let me know if you have any other questions!