
1) Quantum mechanic
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https://www.crosswordclues.com/clue/excited-state

Compare with ground state. An atom or molecule which has absorbed energy is said to be in an excited state. Excited states tend to have short lifetimes; they lose energy either through collisions or by emitting photons to 'relax' back down to their ground states.
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http://antoine.frostburg.edu/chem/senese/101/glossary/e.shtml

Excitation is an elevation in energy level above an arbitrary baseline energy state. In physics there is a specific technical definition for energy level which is often associated with an atom being excited to an excited state. In quantum mechanics an excited state of a system (such as an atom, molecule or nucleus) is any quantum state of the syst...
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http://en.wikipedia.org/wiki/Excited_state

(from the article `energy state`) ...or system, is said to undergo a transition between two energy levels when it emits or absorbs energy. The lowest energy level of a system is ... All the various kinds of excitation that occur in the gas phase may also take place in the condensed states of matter (liquid, glass, or solid), but ... ...
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http://www.britannica.com/eb/a-z/e/58

State of a system with energy higher than that of the ground state. This term is most commonly used to characterize a molecule in one of its electronically excited states, but can also refer to vibrational and/or rotational excitation in the electronic ground state. IUPAC ANALYTICAL CHEMISTRY (1982).
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http://www.chem.qmul.ac.uk/iupac/gtpoc/E.html

Any state other than the ground state of an atom or molecule.
Found on
http://www.chemistry-dictionary.com/definition/excited+state.php

A state of an atom, molecule, or ion when the species has absorbed energy and become elevated ('excited') to a higher energy state as compared with the ground state. The excitation may be electronic, vibrational, rotational, etc. Excited states tend to have short lifetimes; they lose energ...
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http://www.daviddarling.info/encyclopedia/E/excited_state.html

quantum state of a physical system corresponding to an energy level higher than that of the ground state
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=111-14-30

Any state other than the ground state of an atom or molecule.
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http://www.encyclo.co.uk/local/20728

<chemistry, radiobiology> An atom or nucleus which possesses more energy than its ground state energy. ... (16 Dec 1997) ...
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http://www.encyclo.co.uk/local/20973

the condition of a nucleus, atom, or molecule produced by the addition of energy to the system as the result of absorption of photons or of inelastic collisions with other particles or systems.
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http://www.encyclo.co.uk/local/21001

Type: Term Definitions: 1. the condition of an atom or molecule after absorbing energy, which may be the result of exposure to light, electricity, elevated temperature, or a chemical reaction; such activation may be a necessary prelude to a chemical reaction or to the emission of light. Synonyms: activated state
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http://www.medilexicon.com/medicaldictionary.php?t=84686

any of the energy levels of a physical system, esp. an atom, molecule, etc., that has higher energy than the lowest energy level.
Found on
https://www.infoplease.com/dictionary/excited-state
No exact match found.