Preemptor

pre·empt or pre-empt  (pr-mpt)

v. pre·empt·ed, pre·empt·ing, pre·empts

v.tr.

1. To appropriate, seize, or take for oneself before others. See Synonyms at appropriate.

2.

a. To take the place of; displace: A special news program preempted the scheduled shows.

b. To have precedence or predominance over: Discussion of the water shortage will preempt the other topics on this week's agenda.

3. To gain possession of by prior right or opportunity, especially to settle on (public land) so as to obtain the right to buy before others.

v.intr. Games

To make a preemptive bid in bridge.

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[Back-formation from preemption.]

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pre·emptor (-mptôr) n.

pre·empto·ry (-mpt-r) adj.

Thesaurus

Noun	1.	preemptor - someone who acquires land by preemption pre-emptor appropriator - someone who takes for his or her own use (especially without permission)
	2.	preemptor - a bidder in bridge who makes a preemptive bid pre-emptor bidder - someone who makes a bid at cards