adjective . 1. light in weight.
http://dictionary.reference.com/search?q=Lightweight&r=6 ...

The lightweight division in mixed martial arts can refer to a number of different weight classes: The UFC lightweight division, which limits competitors to 155 lb (70 kg) The PRIDE ...
http://en.wikipedia.org/wiki/Lightweight_%28MMA%29

The word lightweight usually refers to a class of athletes in a particular sport, based on their weight. It is also a slang term, indicating insignifigance or ineptitude.
http://en.wikipedia.org/wiki/Lightweight

Take cleaning beyond the living room with lightweight cleaners from Eureka. At Eureka...we live and breathe clean.
http://www.eureka.com/products/lightweight.htm

Lightweight Travel Totes by Daren Otis. Daren makes bags, totes, purses and more. See Daren?s Bags at Royal Oak Farmers Market, Ann Arbor Farmers Market, Kerrytown, Sunday ...
http://www.lightweighttraveltotes.com/