the combustion of fuel inside a cylinder (as in an internal-combustion engine)
a heat engine in which combustion occurs inside the engine rather than in a separate furnace; heat expands a gas that either moves a piston or turns a gas turbine
a process in which a substance reacts with oxygen to give heat and light
the act of burning something
a state of violent disturbance and excitement
occurring within an institution or community
inside the country
innermost or essential
