What does CASE mean?

noun

1. an occurrence of something“it was a case of bad judgment”
2. a special set of circumstances“in that event, the first possibility is excluded”
3. a comprehensive term for any proceeding in a court of law whereby an individual seeks a legal remedy“the family brought suit against the landlord”
4. the actual state of things“that was not the case”
5. a portable container for carrying several objects“the musicians left their instrument cases backstage”
6. a person requiring professional services“a typical case was the suburban housewife described by a marriage counselor”
7. a person who is subjected to experimental or other observational procedures; someone who is an object of investigation“the subjects for this investigation were selected randomly”
8. a problem requiring investigation“Perry Mason solved the case of the missing heir”