Etymology
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deterrent 

1829, adjective ("having the power or tendency to deter") and noun ("that which deters or tends to deter"), in Bentham, from Latin deterrentem, present participle of deterrere "to frighten from, discourage from," from de "away" (see de-) + terrere "frighten, fill with fear" (see terrible). In reference to nuclear weapons, from 1954.

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deterrence (n.)

1788, "act of deterring; that which deters;" see deterrent + -ence. In a Cold War context (1955), "the strategy of demonstrating the will to inflict punitive damage in hopes of convincing the enemy to refrain from an action." Out of it naturally grew the concept of assured destruction.

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massive (adj.)

c. 1400, massif, "forming or consisting of a large mass, having great size and weight or solidity," from Old French massif "bulky, solid," from masse "lump" (see mass (n.1)). Of immaterial things, "substantial, great or imposing in scale," 1580s. Related: Massively; massiveness.

U.S. Cold War deterrent strategy of massive retaliation "threat of using thermonuclear weapons in response to aggression against the United States or its allies by the Soviet Union," whether nuclear or conventional, was introduced by Secretary of State J.F. Dulles in a speech on Jan. 12, 1954.

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mutual (adj.)

late 15c., "reciprocally given and received," originally of feelings, from Old French mutuel (14c.), from Latin mutuus "reciprocal, done in exchange," from PIE root *mei- (1) "to change, go, move," "with derivatives referring to the exchange of goods and services within a society as regulated by custom or law" [Watkins].

The meaning "common" is from 1630s. "Used in this sense loosely and improperly (but not infrequently, and by many writers of high rank), especially in the phrase a mutual friend" [Century Dictionary].

That is common which pertains equally to two or more persons or things. That is mutual which is freely interchanged: mutual love, affection, hatred. The word is sometimes incorrectly used for common: our mutual friend, a phrase of very frequent occurrence, no doubt owing to the perfectly correct 'mutual friendship.' [J.H.A. Günther, "English Synonyms Explained & Illustrated," Groningen, 1904]

Mutual Admiration Society (1851) seems to have been coined by Thoreau. Mutual fund is recorded from 1950.

The Cold War's mutual assured destruction is attested from 1966. Assured destruction was a 1962 term in U.S. military policy circles in reference to nuclear weapons as a deterrent, popularized c. 1964 by Robert McNamara, U.S. Secretary of Defense under Lyndon Johnson, e.g. statement before House Armed Services Committee, Feb. 18, 1965. The notion was "the minimum threat necessary to assure deterrence: the capability to exterminate not less than one third of the Union of Soviet Socialist Republics' (USSR) population in a retaliatory nuclear attack." [Martin Folly, "Historical Dictionary of U.S. Diplomacy During the Cold War"].

By 1964, as the Soviet Union caught up to NATO in ICBMs, the mutual was added, perhaps first by Donald Brennan, conservative defense analyst and a public critic of the policy, who also noted the acronym MAD.)

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