Preemption

Preemption or pre-emption may refer to:

Legal

 * FDA preemption, legal theory in the United States that exempts product manufacturers from tort claims regarding Food and Drug Administration approved products
 * Federal preemption, displacement of U.S. state law by U.S. Federal law
 * Pre-emption rights, the right of existing shareholders in a company to buy shares offered for sale before they are offered to the public
 * Preemption (land), a type of land transfer in the United States, as in the Preemption Act of 1841
 * Preemption Line, the line dividing Indian lands awarded to New York, from those awarded to the Commonwealth of Massachusetts in 1786
 * State preemption, displacement of U.S. municipal law by state law

Other

 * Preempt, a type of bid and a bidding tactic in contract bridge
 * Preemption (computing), the interruption of a computer process without its cooperation in order to perform another task
 * Preemptive war or preemptive strike
 * Traffic signal preemption