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From LSJ

τὸ ἓν καὶ τὸ ὂν πολλαχῶς λέγεται → the term being and the term one are used in many ways, one and being have various meanings, one and being have many senses

Source

Greek Monolingual

-ον, Α
αυτός που βρίσκεται κάτω από το κεφάλι κάποιου.
[ΕΤΥΜΟΛ. < ὑπ(ο)- + -κρηνος (< κρᾶνον, βλ. λ. κρανίο)].