The planned engagement region in space of an interceptor given the sensor timeline, kinematic capabilities of the interceptor, engagement timeline, and operational constraints
Ballistic Missile Defense, Glossary, Version 3.0, Department of Defense, Ballistic Missile Defense Organization, Defense Pentagon, Washington, DC, USA 1997. https://www.google.com.kw/search?q=Ballistic+Missi le+Defense+Glossary.+Version+3.0%2C+June+1997& rlz=1C1BLWB_enKW586KW586&oq=Ballistic+Missile+ Defense+Glossary.+Version+3.0%2C+June+1997&aqs =chrome..69i57.881j0j4&sourceid=chrome&es_ sm=122&ie=UTF-8, (Ballistic Missile Def - Amer) {1025}