The term "acceleration body" is not a standard term in physics or engineering. It's possible you've misheard or misunderstood a phrase.

Here are some possibilities you might be thinking of:

* Accelerated motion: This describes any motion where the velocity is changing.

* Acceleration: This is the rate of change of velocity over time. It's measured in meters per second squared (m/s²).

* Accelerating body: This refers to any object that is undergoing a change in its velocity.

To understand what you're looking for, could you please provide more context or information?

For example:

* Where did you encounter this term?

* What is the context of the situation where this term was used?

* What are you trying to learn about?

With more information, I can help you understand the concept you're interested in.