energy efficiency synonym, energy efficiency definition | Thesaurus

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energy

  
  
activity, animation, ardour, brio, drive, efficiency, élan, elbow grease     (facetious)   exertion, fire, force, forcefulness, get-up-and-go     (informal)   go     (informal)   intensity, life, liveliness, pep, pluck, power, spirit, stamina, strength, strenuousness, verve, vigour, vim     (slang)   vitality, vivacity, zeal, zest, zip     (informal)  
English Collins Dictionary - English synonyms & Thesaurus  
Collaborative Dictionary     English Thesaurus
n.
renewable energy obtainable on coasts based on the sea or ocean low and high tides
exp.
spend time and energy doing something that is pointless
expression arisen in the 15th century when Newcastle (England) was a major exporter of coal

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"