An Etymological Dictionary of Astronomy and Astrophysics
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1) Any chemical reaction in which a substance (fuel) combines with oxygen to produce heat and often light. Combustion reactions usually involve a complex sequence of free-radical chain reactions. The light is produced by excited atoms, molecules, or ions.
2) → nuclear combustion.

M.E., from O.Fr. combustion, from L. combustionem (nominative combustio) "a burning," noun of action from p.p. stem of comburere "to burn," from → com-, intensive prefix + urere "to burn."

Suzeš, → burning

→ nuclear burning.

→ nuclear; → combustion.

The self-ignition of a substance that produces sufficient heat within itself, by a slow oxidation process, for ignition to take place without the need for an external high-temperature source. The produced heat energy is absorbed by the substance raising its temperature slowly until the → ignition temperature is reached. Same as spontaneous ignition.

→ spontaneous; → combustion.