Strategic Defense Initiative

proper noun

A system proposed by U.S. President Ronald Reagan on March 23, 1983, to use ground-based and space-based systems to protect the United States from attack by strategic nuclear ballistic missiles.

Similar
SDIStar Wars
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Meanings

proper nounthe Strategic Defense Initiative
  1. historicalA system proposed by U.S. President Ronald Reagan on March 23, 1983, to use ground-based and space-based systems to protect the United States from attack by strategic nuclear ballistic missiles.

    Synonyms: SDI, Star Wars

Synonyms & antonyms

proper nounA system proposed by U.S. President Ronald Reagan on March 23, 1983, to use ground-based and space-based systems to protect the United States from attack by strategic nuclear ballistic missiles.

Similar
SDIStar Wars
Cite this entry
APA

Strategic Defense Initiative. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/Strategic%20Defense%20Initiative

MLA

“Strategic Defense Initiative.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Strategic%20Defense%20Initiative. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “Strategic Defense Initiative,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/Strategic%20Defense%20Initiative.

Source: Strategic Defense Initiative on Wiktionary, CC BY-SA 4.0.