1.  combustion(n = noun.process) burning - a process in which a substance reacts with oxygen to give heat and light;
is a kind of oxidation, oxidisation, oxidization
has particulars: deflagration, fire, flame, flaming, internal combustion
Derived form verb combust₅

2.  combustion(n = noun.state) - a state of violent disturbance and excitement; "combustion grew until revolt was unavoidable"
is a kind of garboil, tumult, tumultuousness, uproar

3.  combustion(n = noun.act) burning - the act of burning something; "the burning of leaves was prohibited by a town ordinance"
is a kind of change of integrity
has particulars: arson, fire-raising, incendiarism, firing, ignition, inflammation, kindling, lighting, incineration
Derived form verb combust₁

1.  The state of burning. [1913 Webster]

2.  The combination of a combustible with a supporter of combustion, producing heat, and sometimes both light and heat. [1913 Webster]
"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." [1913 Webster]

3.  Violent agitation; confusion; tumult. [1913 Webster]
"There [were] great combustions and divisions among the heads of the university." [1913 Webster]
"But say from whence this new combustion springs." [1913 Webster]

combustion, n.
1 burning; consumption by fire.
2 Chem. the development of light and heat from the chemical combination of a substance with oxygen.

Derivative:
combustive adj.

Etymology:
ME f. F combustion or LL combustio f. L comburere combust- burn up

N  calefaction, increase of temperature, heating, calefaction, tepefaction, torrefaction, melting, fusion, liquefaction, burning, ambustion, combustion, incension, accension, concremation, cremation, scorification, cautery, cauterization, ustulation, calcination, cracking, refining, incineration, cineration, carbonization, cupellation, ignition, inflammation, adustion, flagration, deflagration, conflagration, empyrosis, incendiarism, arson, auto dafe, boiling, coction, ebullition, estuation, elixation, decoction, ebullioscope, geyser, distillation (vaporization), furnace, blanket, flannel, fur, wadding, clothing, still, refinery, fractionating column, fractionating tower, cracking tower, match, incendiary, petroleuse, cauterizer, caustic, lunar caustic, alkali, apozem, moxa, acid, aqua fortis, aqua regia, catheretic, nitric acid, nitrochloro-hydric acid, nitromuriatic acid, radioactivity, gamma rays, alpha particles, beta rays, X-rays, radiation, cosmic radiation, background radiation, radioactive isotopes, tritium, uranium, plutonium, radon, radium, sunstroke, coup de soleil, insolation, pottery, ceramics, crockery, porcelain, china, earthenware, stoneware, pot, mug, terra cotta, brick, clinker, cinder, ash, scoriae, embers, soot, slag, coke, carbon, charcoal, wood alcohol, turpentine, tea tree oil, gasoline, kerosene, naptha, fuel oil (fuel), wax, paraffin, residue, tar, inflammability, combustibility, diathermancy, transcalency, conduction, convection, radiation, radiant heat, heat conductivity, conductivity, thermal expansion, coefficient of expansion, heated, molten, sodden, r_echauff_e, heating, adust, inflammable, combustible, diathermal, diathermanous, burnt, volcanic, radioactive.

combustion chamber, internal combustion, spontaneous combustion