<p><strong>Noun</strong></p><ul><li>Also called prep·pies.</li><li>a person who is a student at or a graduate of a preparatory school.</li><li>a person who favors or is viewed as favoring clothing style or behavior associated with traditional preparatory schools.</li></ul><p><strong>Adjective</strong></p><ul><li>prep·pier, prep·pi·est.</li><li>of, relating to, or characteristic of preparatory schools or their students.</li><li>of, pertaining to, characteristic of, or being a style in dress or mode of behavior of a preppy.</li></ul>