Webster's English Dictionary

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productive

pro.duc.tive \-'d*k-tiv\ aj 1: having the quality or power of producing 
   esp. in abundance {~ f ishing waters} 2: effective in bringing about : 
   ORIGINATIVE  3: yielding or furnishing results, benefits, or profits  4a: 
   effecting or contributing to effect production  4b: yielding or devoted to 
   the satisfaction of wants or the creation of ut ilities 5: continuing to be 
   used in the formation of new words or constructions (un- is a ~ prefix} 6: 
   raising mucus or sputum (as from the bronchi) {a ~ cough}  - 
   pro.duc.tive.ly av