An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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population inversion
  واگردانی ِ پرینش، وارونش ِ ~  
vâgardâni-ye porineš, vâruneš-e ~
Fr.: inversion des populations  

In physics, specifically statistical mechanics, the state of an atomic or molecular system in which the number of members in an excited state is larger than those in lower energy states. → optical pumping;
→ inverted population.

See also: → population; → inversion.