adverb Latin.
- in the place or role of a parent.
- in place of a parent: said of a person acting in a parental capacity
Latin, literally “in the place of a parent” (see parent).
To assume the duties and responsibilities of a parent: “Because Jack’s parents were out of town, his sister acted in loco parentis and punished him for staying out so late.” From Latin, meaning “in the place of a parent.”