—n. 1. a special or distinctive mark, token, or device worn as a sign of allegiance, membership, authority, achievement, etc.: a police badge; a merit badge. 2. any emblem, token, or distinctive mark: He considered a slide rule as the badge of an engineering student. 3. a card bearing identifying information, as one's name, symbol or place of employment, or academic affiliation, and often worn pinned to one's clothing.