<p><strong>noun</strong></p><ul><li>A boxer or other contestant intermediate in weight between a bantamweight and a lightweight, especially a professional boxer weighing up to 126 pounds (57 kilograms).</li><li>An insignificant person or thing: He thinks he's a major composer, but he's just a featherweight.</li></ul><p><strong>adjective</strong></p><ul><li>Belonging to the class of featherweights, especially in boxing.</li><li>Extremely light in weight: a featherweight quilt.</li><li>Unimportant; trifling; slight.</li></ul>