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 right A pre-emption right, right of pre-emption, or first option to buy is a contractual right to acquire certain property newly coming into existence before it can be offered to any other person or entity. It comes from the Latin verb ''emo, emere, emi, ...
s, the right of existing shareholders in a company to buy shares offered for sale before they are offered to the public
*
Preemption (land) Preemption was a term used in the nineteenth century to refer to a settler's right to purchase public land at a federally set minimum price; it was a right of first refusal. Usually this was conferred to male heads of households who developed the p ...
, a type of land transfer in the United States, as in the Preemption Act of 1841
*
Preemption Line
The Preemption Line (also spelled Pre-Emption) divided the aboriginal lands of western New York State awarded to New York from those awarded to Commonwealth of Massachusetts by the Treaty of Hartford of 1786. It was defined as the meridian (north ...
, the line dividing Indian lands awarded to New York, from those awarded to the Commonwealth of Massachusetts in 1786
*
State preemption
In United States law, state preemption is the invalidation of some action by, or the wresting of power from, a portion of the state government (more often than not a municipality or other part of the state government that only exercises power withi ...
, 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
{{Disambiguation