Definitions:
a process in which substances combine chemically with oxygen from the air and typically give out bright light, heat, and smoke; combustion or burning

a burning sensation

the shooting of projectiles from weapons, especially bullets from guns

discharge a gun or other weapon in order to propel (a bullet or projectile)

dismiss (an employee) from a job

supply (a furnace, engine, etc.) with fuel

stimulate or excite (the imagination or an emotion)

bake or dry (pottery, bricks, etc.) in a kiln