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
Conditions that enhance learning common to the three approaches are proactivity, critical reflection, and creativity.
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