Question

what is the def of ocsillatory

Answer 1

If a body moves back and forth repeatedly about a mean position, it is said to possess oscillatory motion. Vibrations of guitar strings, the motion of a pendulum bob, vibrations of a tuning fork, and oscillations of the mass suspended from a spring, vibrations of the diaphragm in telephones and speaker system and freely suspended springs are few examples of oscillatory motion. 

Answer 2

One complete cycle of repetitive to and fro motion from one extreme (maximum or minimum )to another (minimum or maximum)and back