All 4 Uses

preemptive
in
Red: The Heroic Rescue
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Inventories of hardware, possible troop movement, preemptive strikes, political will-every possibility had been considered at great length.†
Chpt 11 *
So will pressure to launch a preemptive strike.†
Chpt 13
There are already rumblings of a preemptive nuclear strike, and I think Dwight might reverse himself on this one.†
Chpt 13
If either you or Israel does anything stupid, like try a preemptive strike, you'll send us all to our graves based on an assumption that is more likely wrong than right.†
Chpt 17

Definitions:

(1) (preemptive)
done before something undesired happens to prevent it from happening
(2) (meaning too rare to warrant focus)
The form, preempt can also mean to replace something (typically less important). For example, "The President's speech will preempt our regular broadcast."

Preemptive rights refers to contractual rights that give a party the opportunity to take action (such as buying shares) before others.

In the card game bridge a preemptive bid is an early (usually opening) bid that is so high it interferes with opponents opportunity to exchange information by bidding.