Frequency deviation (Δf) 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. The frequency deviation of a radio i...
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http://en.wikipedia.org/wiki/Frequency_deviation
(from the article `radio`) The variation of carrier frequency is known as the frequency deviation, and for very-high-frequency broadcasting it can reach ± 75 kilohertz. The ...
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http://www.britannica.com/eb/a-z/f/62
the difference between the system frequency at a given instant and the nominal value
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=604-01-06
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