Frequency deviation
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In telecommunication, the term frequency deviation has the following meanings:
The amount by which a frequency differs from a prescribed value, such as the amount an oscillator frequency drifts from its nominal frequency.
In frequency modulation, the absolute difference between the maximum permissible instantaneous frequency of the modulated wave or the minimum permissible instantaneous frequency of the modulated wave and the carrier frequency. Usually written Δf.
In frequency modulation, the maximum absolute difference, during a specified period, between the instantaneous frequency of the modulated wave and the carrier frequency.
Source: from Federal Standard 1037C and from MIL-STD-188