1. An oscillation is defined as the repetitive variation with time t of the displacement x of an object about the equilibrium position (x = 0)
2. Equilibrium position (x = 0) is the position when there is no resultant force acting on an object
3. Displacement (x) of a wave is the distance of a point on the wave from its equilibrium position
4. Period (T) or time period is the time interval for one complete repetition
5. Amplitude (x) is the maximum value of the displacement on either side of the equilibrium position
6. Wavelength (λ) is the length of one complete oscillation measured from the same point on two consecutive waves
7. Frequency (f) is the number of oscillations per second