verb (used with object), energized, energizing.
to give energy to; rouse into activity: to energize the spirit with brave words.
to supply electrical current to or store electrical energy in.
verb (used without object), energized, energizing.
to be in operation; put forth energy.
Also, especially British, energise.

1745–55; energ(y) + -ize

reenergize, verb (used with object), reenergized, reenergizing.
superenergized, adjective
unenergized, adjective

energize, enervate, innervate, invigorate.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
energize or energise (ˈɛnəˌdʒaɪz)
1.  to have or cause to have energy; invigorate
2.  (tr) to apply a source of electric current or electromotive force to (a circuit, field winding, etc)
energise or energise
'energizer or energise
'energiser or energise

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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Word Origin & History

1752; see energy + -ize. Related: Energized; energizing.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The intent was to re-energize interest in interstellar travel in private sectors.
Instead of enervating him, those moments seemed to energize him.
Use the positive to energize your concentration of accomplishing your goals.
These developments energize people to invest in our collective future, and the
  well-being of our planet, despite the economy.
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