2. (Chem.) The combination of a combustible with a supporter
of combustion, producing heat, and sometimes both light
and heat.
Combustion results in common cases from the mutual
chemical action and reaction of the combustible and
the oxygen of the atmosphere, whereby a new compound
is formed. --Ure.
{Supporter of combustion} (Chem.), a gas, as oxygen, the
combination of which with a combustible, as coal,
constitutes combustion.
3. Violent agitation; confusion; tumult. [Obs.]
There [were] great combustions and divisions among
the heads of the university. --Mede.
But say from whence this new combustion springs.
--Dryden.