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Definition of lightweight adjective from the Oxford Advanced Learner's Dictionary

lightweight

adjective
 
/ˈlaɪtweɪt/
 
/ˈlaɪtweɪt/
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  1. made of thinner material and less heavy than usual
    • a lightweight jacket
    • a lightweight aluminium engine
    Topics Physics and chemistryc1
  2. (disapproving) not very serious or impressive
    • a lightweight book
    • He was considered too lightweight for the job.
See lightweight in the Oxford Advanced American Dictionary

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