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What does decay mean?

Looking for the meaning or definition of the word decay? Here's what it means.

Noun
  1. The process or result of being gradually decomposed.
  2. A deterioration of condition.
Verb
  1. (intransitive) To deteriorate, to get worse, to lose strength or health, to decline in quality.
    1. (intransitive, electronics, of storage media or the data on them) To undergo bit rot, that is, gradual degradation.
    2. (computing) To undergo software rot, that is, to fail to be updated in a changing environment, so as to eventually become legacy or obsolete.
    3. (physics) To undergo prolonged reduction in altitude (above the orbited body).
  2. (intransitive, of organic material) To rot, to go bad.
  3. (physics) To change by undergoing fission, by emitting radiation, or by capturing or losing one or more electrons.
  4. (physics) To undergo optical decay, that is, to relax to a less excited state, usually by emitting a photon or phonon.
  5. (intransitive, aviation) Loss of airspeed due to drag.
  6. (transitive) To cause to rot or deteriorate.
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