GRC

ἀμφιδεκάτη

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LSJ

ἡ, Arc. for the 21st of the month, Hsch. (dub.); — also ἀμφιδεκατία, ἡ, IG 5(1).363 (Sparta); cf. ἀμφεικάς.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
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