SDI
noun [ U ] uk/ˌes.diːˈaɪ/ us/ˌes.diːˈaɪ/ (informal Star Wars)
战略防御计划（美国的一个太空防御导弹计划，又称“星球大战”，Strategic Defense Initiative的缩写）
abbreviation for Strategic Defense Initiative: a plan to defend the US from enemy nuclear weapons by destroying them in space