From ἀντίος (antíos): the adverb/preposition is from the adverbial accusative, and the noun is from the neuter singular.
Formally identical to Hittite 𒄩𒀭𒍝𒀭 (ḫa-an-za-an /ḫanzan/) as if from Proto-Indo-European *h₂entíom, though the parallel formations in Greek and Hittite may be independent.[1]
ἀντίον • (antíon)
ἀντίον • (antíon) (governs the genitive)
ἀντῐ́ον • (antĭ́on) n (genitive ἀντῐ́ου); second declension
| Case / # | Singular | Dual | Plural | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominative | τὸ ἀντῐ́ον tò antĭ́on |
τὼ ἀντῐ́ω tṑ antĭ́ō |
τᾰ̀ ἀντῐ́ᾰ tằ antĭ́ă | ||||||||||
| Genitive | τοῦ ἀντῐ́ου toû antĭ́ou |
τοῖν ἀντῐ́οιν toîn antĭ́oin |
τῶν ἀντῐ́ων tôn antĭ́ōn | ||||||||||
| Dative | τῷ ἀντῐ́ῳ tôi antĭ́ōi |
τοῖν ἀντῐ́οιν toîn antĭ́oin |
τοῖς ἀντῐ́οις toîs antĭ́ois | ||||||||||
| Accusative | τὸ ἀντῐ́ον tò antĭ́on |
τὼ ἀντῐ́ω tṑ antĭ́ō |
τᾰ̀ ἀντῐ́ᾰ tằ antĭ́ă | ||||||||||
| Vocative | ἀντῐ́ον antĭ́on |
ἀντῐ́ω antĭ́ō |
ἀντῐ́ᾰ antĭ́ă | ||||||||||
| Notes: |
| ||||||||||||
ἀντίον • (antíon)