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- DictionaryGround state/ˈɡround ˌstāt/
noun
- 1. the lowest energy state of an atom or other particle.
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noun
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The ground state of a quantum-mechanical system is its stationary state of lowest energy; the energy of the ground state is known as the zero-point energy of the system. An excited state is any state with energy greater than the ground state. In quantum field theory, the ground state is usually called the vacuum state or the vacuum. If more than one ground state exists, they are said to be degener... Wikipedia