Definition of preemptions:
(n) :
An act or process that preempts; a preventive or forestalling action; as:
(n) :
(law) The supersession of a conflicting law from a lower jurisdiction by an overlapping law from a higher jurisdiction.
(n) :
(computing) The temporary interruption of a task without its cooperation and with the intention of resuming it at a later time.
(n) :
The purchase of something before it is offered for sale to others.
(n) :
The purchase of public land by the occupant.
(n) :
A township and census-designated place therein, in Mercer County, Illinois, United States.