pre-empt (Verb) — Gain possession of by prior right or opportunity, especially so as to obtain the right to buy (land).
pre-empt (Verb) — Acquire for oneself before others can do so.
pre-empt (Verb) — (bridge) make a preemptive bid in the game of bridge.
pre-empt (Verb) — Take the place of or have precedence over. ex. "live broadcast of the presidential debate pre-empts the regular news hour"
pre-empt (Noun) — A high bid that is intended to prevent the opposing players from bidding.