preemptive

[pree-emp-tiv]
adjective
1.
of or pertaining to preemption.
2.
taken as a measure against something possible, anticipated, or feared; preventive; deterrent: a preemptive tactic against a ruthless business rival.
3.
preempting or possessing the power to preempt; appropriative; privileged: a commander's preemptive authority.
4.
Bridge. pertaining to, involving, or noting an opening bid or an overcall in a suit that is at an unnecessarily high level and that is essentially a defensive maneuver designed to make communication between one's opponents more difficult: a preemptive bid; to give a preemptive response.
Also, pre-emptive.


Origin:
1785–95, Americanism; preempt + -ive

preemptively, adverb

peremptory, preemptive.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
preemptive

adjective
designed or having the power to deter or prevent an anticipated situation or occurrence; "a preemptive business offer" 
WordNet® 3.0, © 2006 by Princeton University.
Cite This Source
Example sentences
Either they preemptively strike and it happens, or they don't do anything and risk it happening.
Signal handlers are invoked preemptively in the main thread of the process.
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