Frequency deviation
Frequency deviation (![f_{\Delta}](/Images/godic/202501/14/807d5fe957c82a4f1fae1094e80fa4f90740.png")
) is used in FM radio to describe the maximum instantaneous difference between an FM modulated frequency and the nominal carrier frequency. The term is sometimes mistakenly used as synonymous with frequency drift, which is an unintended offset of an oscillator from its nominal frequency.