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Etymology edit

From Medieval Latin praeēmptiō (previous purchase), from praeemō (buy before), from Latin prae- (before) + emō (buy).

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Noun edit

preemption (countable and uncountable, plural preemptions)

  1. An act or process that preempts; a preventive or forestalling action; as:
    1. The purchase of something before it is offered for sale to others.
    2. The purchase of public land by the occupant.
    3. (computing) The temporary interruption of a task without its cooperation and with the intention of resuming it at a later time.
    4. (law) The displacement of a lower jurisdiction's laws when they conflict with those of a higher jurisdiction.

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