An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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frequency drift
  دلک ِ بسامد  
delek-e basâmad
Fr.: dérive de fréquence  

An undesired progressive change in an oscillator’s frequency with time.

See also: → frequency; → drift.