Action and effect of deflagration. It means burning spontaneously and unexpectedly, with flame, but without explosion. It is a kind of combustion
It is a combustion, usually spontaneous, that produces flame and fire, but not explosion. See deflagration, and just in case also deflation.
Inflation is continuing and widespread growth of prices of goods and services and factors of production in an economy over time. Other definitions explain the persistent movement to the rise in the general price level or decrease in the purchasing power of money.