1. the position, role, or responsibility of being a custodian; the act of caring for or protecting something or someone
Usage: commonly used in legal, educational, and institutional contexts
2. the legal authority and responsibility for the care and control of a minor or incapacitated person
Usage: legal term; often used in family law and child welfare contexts

Examples

• The museum director accepted custodianship of the rare art collection.
• After her parents' death, her aunt assumed custodianship of the children.
• The library's custodianship of historical documents ensures their preservation for future generations.
• He took on custodianship of the family business when his father retired.
• The court awarded custodianship to the grandparents pending the investigation.
• Environmental custodianship requires protecting natural resources for future generations.
• The university's custodianship of the archives makes them accessible to researchers.