A large, controlled outdoor fire lit to celebrate something or as a signal.

(historical) A fire lit outdoors to burn unwanted items; originally , heretics or other offenders, or banned books; now, generally agricultural or garden waste, or rubbish.

(figurative) Something like a bonfire (sense 1 or 2) in heat, destructiveness, ferocity, etc.

(transitive) Destroy or burn something by setting it alight on a bonfire, or to fire pottery using a bonfire.

(intransitive, rare) To make, or celebrate around, a bonfire.