1. The process or result of being gradually decomposed.
  2. A deterioration of condition.


  1. To deteriorate, to get worse, to lose strength or health, to decline in quality.
    The pair loved to take pictures in the decaying hospital on forty-third street.
  1. To undergo , that is, gradual degradation.
  2. To undergo , that is, to fail to be updated in a changing environment,so as to eventually become legacy or obsolete.
  3. To undergo prolonged reduction in altitude (above the orbitted body).
    2009, Francis Lyall, Paul B. Larsen, Space Law: A Treatise, page 120:
  4. To rot, to go bad.
The cat's body decayed rapidly.
  1. To change by undergoing fission, by emitting radiation, or by capturing or losing one or more electrons.
  2. To undergo , that is, to relax to a less excited state, usually by emitting a photon or phonon.
  3. To cause to rot or deteriorate.
    The extreme humidity decayed the wooden sculptures in the museum's collection in a matter of years.

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