—n. 1. a person who is a student at or a graduate of a preparatory school.
2. a person who favors or is viewed as favoring clothing style or behavior associated with traditional preparatory schools.
—adj. 1. of, pertaining to, or characteristic of preparatory schools or their students.
2. of, pertaining to, characteristic of, or being a style in dress or mode of behavior of a preppy. Also,prep'pie.