[kawst-i-fek-tiv, kost-]
producing optimum results for the expenditure.

cost-effectively, adverb
cost-effectiveness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To cost effective
World English Dictionary
providing adequate financial return in relation to outlay

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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Example sentences
Rechargeable batteries are more cost effective than throwaway batteries over
  the long term.
It is more cost effective and more efficient as well.
Develops multi-year strategy to expand planned gifts effort, ensuring that
  efforts are cost effective.
If a book is recalled more than once every four years or so, it's not cost
  effective to put it in remote storage.
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