being lighter in weight, texture, etc., than another item or object of identical use, quality, or function: a lightweight topcoat; a lightweight alloy for ship construction.
without seriousness of purpose; trivial or trifling: lightweight reading.
of or pertaining to a lightweight: He's the new lightweight contender.
(of a horse, especially a hunter) able to carry up to 165 pounds (75 kg).
a person of less than average weight.
Informal. a person who is of little influence, importance, or effect.
a boxer or other contestant intermediate in weight between a featherweight and a welterweight, especially a professional boxer weighing between 126 and 135 pounds (56.7–61 kg).

1765–75; light2 + weight

ultralightweight, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lightweight (ˈlaɪtˌweɪt)
1.  of a relatively light weight
2.  not serious; trivial
3.  a person or animal of a relatively light weight
4.  a.  a professional boxer weighing 130--135 pounds (59--61 kg)
 b.  an amateur boxer weighing 57--60 kg (126--132 pounds)
 c.  (as modifier): the lightweight contender
5.  a wrestler in a similar weight category (usually 115--126 pounds (52--57 kg))
6.  informal a person of little importance or influence

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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Word Origin & History

1773 in pugilism and horse-racing; from light (adj.) + weight. Figurative sense of "inconsequential" first attested 1809.
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

lightweight definition

  1. mod.
    inconsequential. : This is a fairly lightweight matter.
  2. n.
    an inconsequential person; someone who accomplishes very little. : Don't worry about her. She's just a lightweight.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
Books find a home alongside art and other treasures on these lightweight
  suspension shelves.
It's an affordable and lightweight alternative to wood.
Also steer clear of lightweight or shriveled bulbs, since these may have lost
  too much moisture to recover well.
Sometimes a skirt or lightweight cotton pants with a simple top or a tank with
  a cardigan.
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