1899, see ecology + -ical. Related: Ecologically.
an ecological disaster
ecological research
ecliptic
eclogue
eco-
ecocentric
ecofriendly
ecological
ecologist
ecology
e-commerce
econometric
economic
)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}