pro-active

proactive

[proh-ak-tiv]
adjective
serving to prepare for, intervene in, or control an expected occurrence or situation, especially a negative or difficult one; anticipatory: proactive measures against crime.

Origin:
1930–35; pro-1 + active

proactive, noun
proactivity, proactiveness, noun
proactively, adverb

proactive, reactionary, reactive.
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World English Dictionary
proactive (prəʊˈæktɪv)
 
adj
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
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Etymonline
Word Origin & History

pro-active
1971, of persons or policies, coined from pro- + active on model of react/reactive. Used from 1933 in a psychological sense.

proactive
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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