Definition from Wiktionary, the free dictionary
heavyweight (plural heavyweights)
- A very large, heavy, or impressive person.
- an intellectual heavyweight
- The professional boxing weight division for boxers weighing more than 190 pounds; a boxer in that division.
- A similar division and contestant in other sports.
heavyweight (not comparable)
- Of the heavyweight boxing (or similar) division.
- Being relatively heavy.
- Being a leader in one's field.