Pre*ëmp"tion (?; 215), n. [Pref. pre- + emption: cf. F. préemption. See Redeem.] The act or right of purchasing before others. Specifically: (a) The privilege or prerogative formerly enjoyed by the king of buying provisions for his household in preference to others. [Eng.] (b) The right of an actual settler upon public lands (particularly those of the United States) to purchase a certain portion at a fixed price in preference to all other applicants. Abbott.