serving to prepare for, intervene in, or control an expected occurrence or situation, especially a negative or difficult one; anticipatory: proactive measures against crime.

1930–35; pro-1 + active

proactive, noun
proactivity, proactiveness, noun
proactively, adverb

proactive, reactionary, reactive. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
proactive (prəʊˈæktɪv)
1.  tending to initiate change rather than reacting to events
2.  psychol of or denoting a mental process that affects a subsequent process
[C20: from pro-² + (re)active]

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

1933, in psychology (learning theory), from pro- + active. As an opposition to reactive, attested from 1971 (see react).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If you're having a hard time resolving a problem, take a proactive approach and
  (politely) suggest a solution.
When the job market is tight, we need to be proactive.
The airports say they had few stranded passengers as airlines' proactive
  cancellations and news reports kept travelers away.
My wife and I decided to be proactive -- and selective -- in my job search.
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