Preemption

Preemption or pre-emption may refer to:

• 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

• 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