Etymology
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energetic (adj.)

1650s, "powerful in operation," from Greek energetikos "active," from energein "to work, be in action, act upon" (see energy). Of persons, "active," in English from 1796 (energetical "operative" is from c. 1600; from 1630s as "full of energy," while energical is attested from 1560s). Related: Energetically.

updated on August 30, 2014

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Definitions of energetic from WordNet

energetic (adj.)
possessing or exerting or displaying energy;
an energetic fund raiser for the college
it caused an energetic chemical reaction
an energetic group of hikers
energetic (adj.)
working hard to promote an enterprise;
Synonyms: gumptious / industrious / up-and-coming
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.