An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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cardinal number
  عدد ِ اگرا  
adad-e agrâ
Fr.: nombre cardinal  

An ordinary number such as 0, 1, 2, or 3, as opposed to an → ordinal number such as 1st, 2nd, or 3rd. Cardinal numbers can be → zero or → positive
and are used for counting the things that are assumed to be not divisible.

See also: → cardinal; → number.