Define Acceleration.
Ty!​

Acceleration is the name we give to any process where the velocity changes. Since velocity is a speed and a direction, there are only two ways for you to accelerate: change your speed or change your direction—or change both.

Acceleration is the rate of change of velocity per unit of time.Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.

it is very well related to a lot of things but with my limited knowledge i can confidently say that the answer is space.