Guardian/ˈɡɑːrdiən/ Definition 1 of 3Pro Tip 1/3Legal Authority The guardian has legal responsibilities, similar to those of a parent to a child. Her aunt is her legal guardian and signs all her school documents. Pro Tip 2/3Not Parental A guardian is not always a parent but has a similar caring role. Though not her father, her guardian ensures she completes her homework. Pro Tip 3/3Adoption Distinction Being a guardian is different from adopting a child; it's often a temporary legal role. He's the guardian for now but plans to adopt her next year.