Etymology
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ICBM (n.)

also I.C.B.M., 1955, initialism (acronym) for Inter-Continental Ballistic Missile. IBM in the same sense is from 1954.

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Definitions of ICBM

icbm (n.)
a ballistic missile that is capable of traveling from one continent to another;
Synonyms: intercontinental ballistic missile
From wordnet.princeton.edu