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

1850–55; heavy + weight

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
heavyweight (ˈhɛvɪˌweɪt)
1.  a person or thing that is heavier than average
2.  a.  a professional boxer weighing more than 175 pounds (79 kg)
 b.  an amateur boxer weighing more than 81 kg (179 pounds)
 c.  (as modifier): the world heavyweight championship
3.  a wrestler in a similar weight category (usually over 214 pounds (97 kg))
4.  informal an important or highly influential person

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

heavyweight definition

High-overhead; baroque; code-intensive; featureful, but costly. Especially used of communication protocols, language designs, and any sort of implementation in which maximum generality and/or ease of implementation has been pushed at the expense of mundane considerations such as speed, memory use and startup time. Emacs is a heavyweight editor; X is an *extremely* heavyweight window system. This term isn't pejorative, but one hacker's heavyweight is another's elephantine and a third's monstrosity.
Opposite: "lightweight". Usage: now borders on technical especially in the compound "heavyweight process".

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
More than a dozen heavyweight scholars have signed up as contributors there.
And it would it be enhanced by having both heavyweight and welterweight
The gas clouds whence they come tend to fragment, leading to multiple middling
  stars rather than a single heavyweight one.
Newton was not the only intellectual heavyweight from his era trying to make
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