Defense Health Agency. The Defense Health Agency (DHA) is a joint, integrated Combat Support Agency that enables the U.S Army, U.S Navy, and U.S Air Force medical services to provide a medically ready force and ready medical force to Combatant Commands in both peacetime and wartime.
Definition of preemption. 1a : the right of purchasing before others; especially : one given by the government to the actual settler upon a tract of public landb : the purchase of something under this right.
Wiktionary (0.00 / 0 votes) Rate this definition: preemptive (Adjective). of or relating to preemption. preemptive (Adjective). made so as to gain an advantage when an enemy strike is anticipated. preemptive (Adjective). made so as to deter an anticipated unpleasant situation.iktionary (0.00 / 0 votes) Rate this definition: preemptive (Adjective). of or relating to preemption. preemptive (Adjective). made so as to gain an advantage when an enemy strike is anticipated. preemptive (Adjective). made so as to deter an anticipated unpleasant situation.