definitions

SIOP

[ sahy-op ]
/ ˈsaɪ ɒp /

noun

(formerly) the secret and central U.S. contingency plan for waging a nuclear war with the Soviet Union.

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Origin of SIOP

s(ingle) i(ntegrated) o(perations) p(lan)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019