mutual

• adj.

語源はアラビア語の muttus、交換、相互、PIE*mei、変化、交換、語源は mutable、共通と同じ。

mutual (adj.)

late 15c., originally of feelings, from Middle French mutuel (14c.), from Latin mutuus "reciprocal, done in exchange," from PIE root *mei- (1) "to change, exchange" (see mutable).

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 attested from 1966. (Assured destruction was an early 1960s 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 mutual perhaps first added by Donald Brennan, conservative defense analyst and a public critic of the policy, who also noted the acronym MAD.)

mutual (n.)

short for mutual fund, 1971; see mutual.

1. It 's plain that he adores his daughter，and the feeling is mutual .

彼は自分の娘が大好きで、娘も彼のことが好きであることを明らかにしている。

2.He left the company by mutual consent last September.

昨年9月、双方の同意を得て会社を離れた。

3.The campaign has abounded in mutual accusations of uncivilised behaviour.

イベント全体で、双方は相手の粗野さを頻繁に非難している。

4.She learned her insurance had been canceled by Pacific Mutual Insurance Company.

彼女は自分の保険が太平洋共済保険会社によって中止されたことを知った。

5.They do，however，share a mutual interest in design.

しかし、彼らは確かにデザインに興味を持っています。