Definitions
1.NounA very large, heavy, or impressive person."an intellectual heavyweight"
2.NounThe professional boxing weight class for boxers weighing more than 190 pounds; a boxer in that division.
3.NounA similar division and contestant in other sports.
4.AdjectiveOf the heavyweight boxing (or similar) division.
5.AdjectiveBeing relatively heavy.
6.AdjectiveBeing a leader in one's field.
7.AdjectiveImportant or impressive.