An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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secular term
  ترم ِ دیریاز  
tarm-e diryâz
Fr.: terme séculaire  

In perturbation theory used in celestial mechanics, a steadily increasing disturbance. → periodic term.

See also: → secular; → term.