noun
: the energy level of an atomic electron system, atomic nucleus, or other systems of interacting elementary particles having the least energy of all its possible states — called also ground level
noun
: the energy level of an atomic electron system, atomic nucleus, or other systems of interacting elementary particles having the least energy of all its possible states — called also ground level
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012