<p><strong>Adjective</strong></p><ul><li>heavy in weight.</li><li>of more than average weight or thickness: a coat of heavyweight material.</li><li>noting or pertaining to a boxer, wrestler, etc., of the heaviest competitive class, especially a professional boxer weighing more than 175 pounds (79.4 kilograms).</li><li>of or relating to the weight class or division of such boxers: a heavyweight bout.</li><li>(of a riding horse, especially a hunter) able to carry up to 205 pounds (93 kilograms).</li><li>designating a person, company, nation, or other entity that is extremely powerful, influential, or important: a team of heavyweight lawyers.</li></ul><p><strong>Noun</strong></p><ul><li>a person of more than average weight.</li><li>a heavyweight boxer or wrestler.</li><li>a person, company, nation, or other entity that is powerful and influential: a price hike initiated by the heavyweights in the industry.</li></ul>