"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.
the agreement was mutually satisfactory
muttonhead
mutual
mutualism
mutualistic
mutuality
mutually
muumuu
Muzak
muzzle
muzzy
mwah
)window.location='https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=byronic106@yahoo.com&lc=US&item_name=Donation+to +Help+Keep+Etymonline+Free+and+Open&no_note=0&cn=&curency_code=USD&bn=PP-DonationsBF:btn_donateCC_LG.gif:NonHosted'){kind=link}