Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Possessing, exerting, or displaying energy. See Synonyms at active.
  • adj. Of or relating to energy.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Possessing, exerting, or displaying energy.
  • adj. Of or relating to energy.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having energy or energies; possessing a capacity for vigorous action or for exerting force; active.
  • adj. Exhibiting energy; operating with force, vigor, and effect; forcible; powerful; efficacious

from The Century Dictionary and Cyclopedia

  • Possessing, exerting, or manifesting energy; specifically, acting or operating with force and vigor; powerful in action or effect; forcible; vigorous: as, an energetic man or government; energetic measures, laws, or medicines.
  • Synonyms Strenuous, assiduous, potent.
  • In physical, of or pertaining to energy or to the science of energetics.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. working hard to promote an enterprise
  • adj. possessing or exerting or displaying energy

Etymologies

Greek energētikos, from energein, to be active, from energos, active; see energy.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ἐνεργητικός (energētikos), from ἐνεργέω (energeō, "to be active"), from ἐνεργός (energos, "active") (Wiktionary)

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