An Etymological Dictionary of Astronomy and Astrophysics
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An atom in which one or more of its bound electrons are at → energy levels higher than their normal level.

Excited p.p. of → excite; → atom.

The condition of a particle or system of particles (especially an atom, nucleus, molecule) after absorbing energy from outside and transiting to a higher → energy level than that of its → ground state. Excited states are transitory as they lose energy through emissions or collisions and return to ground state.

Excited, p.p. of → excite; → state.