Webster's English Dictionary

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lightweight

1. light.weight \'li-t-.wa-t\ n 1: one of less than average weight; specif 
   : a boxer of the class w hose maximum weight is 135 pounds 2: an 
   ineffectual, intellectually weak, or inadequately qualified person 
2. lightweight aj 1: of, relating to, or characteristic of a lightweight  
   2: having less than average weight  3: INCONSEQUENTIAL