An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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periodic term
  ترم ِ دوره‌ای  
tarm-e dowre-yi
Fr.: terme périodique  

In perturbation theory used in celestial mechanics, a term that indicates a bounded disturbance which recurs regularly. → secular term.

See also: → periodic; → term.