noun

the action of forcing or throwing something out; emission.

an explosive ejection of ash

emission,discharge,expulsion,release,exudation,excretion,elimination,disgorgement,throwing out,removal,ousting,eviction,dispossession,banishment,deportation,exile,dismissal,lay-off,redundancy,notice,cashiering,sacking,the sack,firing,axing,the boot,the push,the (old) heave-ho,the bullet,defenestration,turfing out,one’s cards,the chop,the bum’s rush