What is the meaning of the word "titular"?

Definitions:

existing in name only adjective
- The character is merely titular; the story wasn't based off of real events.
of or associated with or bearing a title signifying nobility adjective
- titular dignitaries
of or bearing a title signifying status or function adjective
- of titular rank
of or pertaining to the title of a work of art adjective
- performed well in the titular (or title) role
of or relating to a legal title to something adjective
- titulary rights