"by (good) fortune," 1540s, from fortunate + -ly (2).
fortunately the weather was good
Fortran
fortress
fortuitous
fortuity
fortunate
fortunately
fortune
fortune cookie
fortune-teller
forty
forum
)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}