pre·emp·tion or pre-emp·tion (prē-ěmpshən)
n.
►
■ The right to purchase something before others, especially the right to purchase public land that is granted to one who has settled on that land.
■ A purchase made by such a right.
► Prior seizure of, appropriation of, or claim to something, such as property.

[TahlilGaran] American Dictionary ▲

preemption
[pre- + Latin ēmptiō, ēmptiōn-, buying (from ēmptus, past participle of Latin emere, to buy. See em- in Indo-European Roots).]

[TahlilGaran] American Dictionary ▲