Motion in which an object moves to and fro about a mean position is called:

1. Some motions repeat by going round and some by going back and forth. 2. Here the object returns through the same central point each time. 3. The object moves to and fro about a mean position, so the motion is oscillatory. 4. So the answer is oscillatory. _Source: syllabus Physics Part II, Ch 13 'Oscillations'_