Custodianship (noun)

The position, function or duty of a custodian; the state of being a custodian; the care, keeping or charge of something.

Origin:

From the word "custodian" and "-ship".

Examples:

1. He accepted the custodianship of the property.
2. The custodianship of the museum is a big responsibility.
3. Custodianship is a position of trust.
4. The custodianship of the documents was given to the librarian.
5. The custodianship of the artwork is important for preservation.