pro·ac·tive

[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

pro·ac·tive, noun
pro·ac·tiv·i·ty, pro·ac·tive·ness, noun
pro·ac·tive·ly, adverb

proactive, reactionary, reactive.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
proactive (prəʊˈæktɪv) [Click for IPA pronunciation guide]
 
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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00:10
Proactive is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Etymonline
Word Origin & History

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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Example sentences
It's a very powerful proactive way to deal with health.
When the job market is tight, we need to be proactive.
And you have to be proactive, but you also have to keep your options open.
They need to be more proactive, provide better information and engage parents
  much earlier than is usually the case.
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