Know how to use "fewer" and "less"? Find out.
1560s, from Middle French ejection and directly from Latin ejectionem, noun of action from past participle stem of ejicere (see eject). The jet pilot's ejection seat (also ejector seat) is from 1945.
ejection e·jec·tion (ĭ-jěk'shən)
The act of driving or casting out by physical force from within.