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Amplitude
The maximum displacement from equilibrium (or, for sound, the maximum pressure variation) of the oscillation.
Frequency
Frequency is the number of complete waves passing a point each second.
Time period
The time taken for one full oscillation (cycle) of the medium at a point.
Wave Equation
The relationship $v=f\lambda$ that links wave speed $v$, frequency $f$, and wavelength $\lambda$.
Wave speed
The rate at which a wave pattern (a crest, compression, or other point of constant phase) moves through a medium.
Wavelength
The distance between two points on a wave that are in the same phase, such as from one compression to the next compression.