dissingwish between varible and contant acceleration

Acceleration:

It is time rate at which the change in velocity occurs.

Uniform acceleration (or) Constant acceleration:

If the rate at which change in velocity occur remains constant, then the acceleration is said to be constant.
In this case, velocity increases uniformly with time.

Non uniform acceleration (or) Variable acceleration:

If the rate at which change in velocity occur is not constant, then the acceleration is said to be variable.
In this case, velocity increases nonuniformly with time.