Etymology
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proactive (adj.)

also pro-active, of persons or policies, as an opposition to reactive, "taking the initiative in a situation, anticipating events" as opposed to responding to them, 1921, from pro- + active. From 1933, in psychology (learning theory). Related: Proactively; proactiveness; proactivity.

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Definitions of proactive

proactive (adj.)
descriptive of any event or stimulus or process that has an effect on events or stimuli or processes that occur subsequently;
proactive interference
proactive inhibition
proactive (adj.)
(of a policy or person or action) controlling a situation by causing something to happen rather than waiting to respond to it after it happens;
From wordnet.princeton.edu