Astronomy .

a meteoroid that has entered the earth's atmosphere.

a transient fiery streak in the sky produced by a meteoroid passing through the earth's atmosphere; a shooting star or bolide.

any person or object that moves, progresses, becomes famous, etc., with spectacular speed.

(formerly) any atmospheric phenomenon, as hail or a typhoon.

( initial capital letter ) Military . Britain's first operational jet fighter, a twin-engine aircraft that entered service in 1944.