An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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secular change
  دگرشد ِ دیریاز، دگرش ِ ~  
degaršod-e diryâz, degareš-e ~
Fr.: changement séculaire  

A continuous, non-periodic change in one of the attributes of the states of a system. Often, a change in an orbit due to dissipation of energy. See also → canonical change.

See also: → secular; → change.