energetic

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Concise Oxford English Dictionary © 2008 Oxford University Press:
energetic /ˌɛnəˈdʒɛtɪk/
adjective
  • 1 showing or involving great energy or activity.
  • 2 Physics relating to energy.
– derivatives
energetically adverb.
– origin C17 (in the sense ‘powerfully effective’): from Gk energētikos, from energein ‘work in or upon’.
'energetic' also found in these Oxford entries:

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