The term that describes an object moving in two dimensions as it is acted on by gravity is projectile motion.

Here's why:

* Two Dimensions: Projectile motion involves movement both horizontally and vertically.

* Gravity: The primary force acting on the object is gravity, which pulls it downward.

Examples of projectile motion:

* A ball thrown through the air

* A cannonball fired from a cannon

* A rocket launched into space (until it reaches a significant altitude)

Let me know if you'd like to explore any specific aspects of projectile motion!