Simple definition of uniform velocity and uniform acceleration

Uniform velocity: A body is said to be moving with uniform velocity if its average velocity between any two points along its path is the same in magnitude as well as direction.

Or

A body is said to be moving with uniform velocity is it always moves in the same direction and covers equal distances in equal intervals of time, however small these intervals may be.

Uniform Acceleration. A body is said to be moving with uniform acc. if its average acc. between any two points along its path is the same in magnitude as well as direction.

Or

A body is said to be moving h uniform acceleration if its velocity changes by equal amounts in equal intervals of time, however small these intervals may be.