A more thorough explanation:

res universitatis

Res universitatis refers to things that belong to a group or organization and can be used by all its members.

• A library owned by a university is an example of res universitatis because it belongs to the university and can be used by all its students and faculty members.
• A sports facility owned by a community center is also an example of res universitatis because it belongs to the community and can be used by all its members.

These examples illustrate the definition of res universitatis because they both involve things that are owned by a group or organization and are available for use by all its members. In both cases, the library and sports facility are not owned by any one individual, but rather by the university or community center as a whole, and are therefore considered res universitatis.