Ground-state meaning

The state of least possible energy in a physical system, as of elementary particles.
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The lowest energy state of a particle, atom, etc.
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The state of a physical system having the lowest possible potential energy. For example, an electron in the lowest energy orbital in a hydrogen atom is in a ground state. The ground state of a physical system tends to be stable unless energy is applied to it from the outside; states that are not the ground state have a tendency to revert to the ground state, giving off energy in the process.
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(physics) The stationary state of lowest energy of a particle or system of particles.
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