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The Collaborative International Dictionary
OEcology

OEcology \[OE]*col"o*gy\ ([-e]*k[o^]l"[-o]*j[y^]), n. [Gr. o'i^kos house + -logy.] (Biol.) The various relations of animals and plants to one another and to the outer world; -- now more commonly spelled ecology. [Also spelled ecology.]

Wiktionary
oecology

n. (context archaic English) (alternative spelling of ecology English)