An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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free occurrence
  رخداد ِ آزاد  
roxdâd-e âzâd
Fr.: occurrence libre  

An → occurrence of a → variable in a → wff, → iff it is not a → bound occurrence.

See also: → bound; → occurrence.