what is oscillation-
Definition of oscillation. 1  1 : the action or state of oscillating stays can be effectively used to prevent oscillations in new bridges â D. B. Steinman. 2  2 : variation, fluctuation famines due to excessive storminess and violent oscillations of rain and drought, heat and cold â Ellsworth Huntington.
The number oscillations per second is called the frequency (applies to pendulum, frequency fork or any oscillatory movement). The model of simple pendulum is the most helpful to study oscillations and the study of osillatory movements.