Hi,
There are two types of motion
1.Translational motion
2.Rotational motion
In rotational motion, the body doesn't change its position with respect to a mean position.
Example: spinning top.
In translational motion, the body as a whole moves from one place to another with respect to a mean position.
Motion along one dimension is translatory motion. In this motions, direction of motion of all the particles of a rigid body are in same direction and having same velocities.
Example: motion of a car.
@Sujata, Good effort. Keep up this good job!