What Does the Term Deflagrate Mean?

intransitive verb. : to burn rapidly with intense heat and sparks being given off.

What is meant by the term deflagration?

Deflagrations are rapidly burning fires in which the combustion zone propagates at a velocity that is slower than the speed of sound.

What do u mean by combustion?

Combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame.