Expulsion, also known as dismissal, withdrawal, or permanent exclusion, is the permanent removal or banning of a student from a school, school district, college, university, or TAFE due to persistent violation of that institution's rules, or in extreme cases, for a single offense of marked severity. Colloquialisms for expulsion include being "kicked out of school", "expelled", or "sent down". Laws and procedures regarding expulsion vary between countries and states.