\begin{definition}[Definition:Simple Harmonic Motion/Frequency]
Consider a physical system $S$ in a state of simple harmonic motion:
:$x = A \map \sin {\omega t + \phi}$
The '''frequency''' $\nu$ of the motion of $S$ is the number of complete cycles per unit time:
:$\nu = \dfrac 1 T = \dfrac \omega {2 \pi}$
\end{definition}