WordNet
n. the lowest tone of a harmonic series [syn: fundamental, first harmonic]
Wikipedia
The fundamental frequency, often referred to simply as the fundamental, is defined as the lowest frequency of a periodic waveform. In music, the fundamental is the musical pitch of a note that is perceived as the lowest partial present. In terms of a superposition of sinusoids (e.g. Fourier series), the fundamental frequency is the lowest frequency sinusoidal in the sum. In some contexts, the fundamental is usually abbreviated as f (or FF), indicating the lowest frequency counting from zero. In other contexts, it is more common to abbreviate it as f, the first harmonic. (The second harmonic is then f = 2⋅f, etc. In this context, the zeroth harmonic would be 0 Hz.)
Usage examples of "fundamental frequency".
Sound therapists maintain that all our organs and cells behave rather like the heart, and that all disease is manifested by a change in the fundamental frequency of the vibration of energy output of the body.
They were connected to the drive core with gleaming cables that glowed and sparked and writhed in time to its fundamental frequency.