Mutually
来自Big Physics
late 15th century: from Old French mutuel, from Latin mutuus ‘mutual, borrowed’; related to mutare ‘to change’.
wiktionary
mutual + -ly
etymonline
mutually (adv.)
"reciprocally, in a manner of giving and receiving," 1530s, from mutual + -ly (2). The meaning "conjointly, in common" (1590s) is "Held to be an erroneous use" [Century Dictionary]. Mutually exclusive is recorded by 1650s. For mutually assured destruction, see mutual.
