1944, "departure from a standard in behavior or state;" see deviant + -ance. A sociologists' word, perhaps coined because statisticians and astronomers already had claimed deviation.
devastation
develop
developer
development
developmental
deviance
deviant
deviate
deviation
device
devil
)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}