- 1[uncountable, countable] expulsion (from…) the act of forcing someone to leave a place; the act of expelling someone These events led to the expulsion of senior diplomats from the country. Troops are engaged in the expulsion of enemy forces from the area.
- 2 [uncountable, countable] expulsion (from…) the act of sending someone away from a school or an organization, so that they can no longer attend it or belong to it; the act of expelling someone The principal threatened the three girls with expulsion. The team faces expulsion from the football league.
- 3[uncountable] expulsion (from…) (formal) the act of sending or driving a substance out of your body or a container the expulsion of air from the lungs