title: Preemption
text: # 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
  