preemptive

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pre·emp·tive / prēˈemptiv/ • adj. serving or intended to preempt or forestall something, esp. to prevent attack by disabling the enemy: preemptive action a preemptive strike. ∎  relating to the purchase of goods or shares by one person or party before the opportunity is offered to others: preemptive rights. ∎  Bridge denoting a bid, typically an opening bid, intended to be so high that it prevents or interferes with effective bidding by the opponents.