Heavyweight

Noun

1. A very large, heavy, or impressive person.an intellectual heavyweight
2. The professional boxing weight division for boxers weighing more than 190 pounds; a boxer in that division.
3. A similar division and contestant in other sports.

Full definition of heavyweight

Adjective

1. Of the heavyweight boxing (or similar) division.
2. Being relatively heavy.
3. Being a leader in one's field.