Custodial/kʌˈstəʊdiəl/ Definition 1 of 4Pro Tip 1/2Protective Role Indicates a person has legal authority and responsibility to care for someone. The aunt took on a custodial role for her niece. Pro Tip 2/2Not Always Parents Custodial doesn't just apply to parents; it can be guardians or other legal caregivers. Her custodial responsibilities were granted by the court.