expulsion

This term carries a strong sense of finality and authority, often implying a punitive or corrective action. In social or academic contexts, it suggests a severe breach of rules that renders a person unwelcome or unfit for membership, creating a sharp boundary between the insider and the outcast.

In biological or physical contexts, the word describes a mechanical or physiological process of ejection. It is a neutral, descriptive term used to explain the movement of gases, fluids, or solids from an internal space to an external one.