HEAVYWEIGHT
colossus, behemoth, giant, heavyweight, titan
(noun) a person of exceptional importance and reputation
giant, hulk, heavyweight, whale
(noun) a very large person; impressive in size or qualities
heavyweight
(noun) a professional boxer who weighs more than 190 pounds
heavyweight
(noun) a wrestler who weighs more than 214 pounds
heavyweight
(noun) an amateur boxer who weighs no more than 201 pounds
Source: WordNet® 3.1
Etymology
Noun
heavyweight (plural heavyweights)
A very large, heavy, or impressive person.
(uncountable) The professional boxing weight class for boxers weighing more than 190 pounds; a boxer in that division.
(uncountable) A similar division and contestant in other sports.
Adjective
heavyweight (not comparable)
Of the heavyweight boxing (or similar) division.
Being relatively heavy.
Being a leader in one's field.
Important or impressive.
Source: Wiktionary