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combustion (n.)

"action or process of burning," early 15c., from Old French combustion (13c.) and directly from Latin combustionem (nominative combustio) "a burning," noun of action from past-participle stem of Latin comburere "to burn up, consume," from com-, here perhaps an intensive prefix (see com-), + *burere, based on a faulty separation of amburere "to burn around," which is properly ambi-urere, from urere "to burn, singe" (from PIE root *heus- "to burn;" see ember).

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Definitions of combustion from WordNet

combustion (n.)
a process in which a substance reacts with oxygen to give heat and light;
Synonyms: burning
combustion (n.)
a state of violent disturbance and excitement;
combustion grew until revolt was unavoidable
combustion (n.)
the act of burning something;
Synonyms: burning
From wordnet.princeton.edu