Webster's English Dictionary

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preemptive

pre.emp.tive \-'em(p)-tiv\ aj 1: of or relating to preemption : having 
   power to preempt  2: of a bid in bridge that is higher than necessary and 
   designed to shut o ut bids by the opponents giving a stockholder first 
   option to purchase new stock in an amount proportionate to his existing 
   holdings {~ right} - pre.emp.tive.ly av