Oscillation
A regular repeating motion
Period
The time taken for one whole cycle of an oscillation
Frequency
The number of whole cycles occurring in one second
Displacement
How far the quantity that is in an oscillation has moved from its rest value
Amplitude
The maximum value of displacement ( height of a wave)
Wavelength
Distance from peak to peak, or trough to trough
Transverse wave
Oscillations perpendicular to the direction of energy transfer
Longitudinal waves
Oscillations parallel to the direction of energy transfer. Areas of compression and rarefaction