μυστηρίων (mysterion)

μυστηρίων is an Ancient Greek form of μυστήριον, meaning “mystery, secret rite”. It is the genitive plural neuter noun.

Found 80 times in the Ancient Greek texts on Socratos.

Where it is used

Thucydides, History of the Peloponnesian War 6.53.1: καὶ καταλαμβάνουσι τὴν Σαλαμινίαν ναῦν ἐκ τῶν Ἀθηνῶν ἥκουσαν ἐπί τε Ἀλκιβιάδην ὡς κελεύσοντας ἀποπλεῖν ἐς ἀπολογίαν ὧν ἡ πόλις ἐνεκάλει, καὶ ἐπ’ ἄλλους τινὰς τῶν στρατιωτῶν τῶν μετ’ αὐτοῦ μεμηνυμένων περὶ τῶν μυστηρίων ὡς ἀσεβούντων, τῶν δὲ καὶ περὶ τῶν Ἑρμῶν.

All forms of μυστήριον (declension table)

Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Liddell-Scott-Jones, A Greek-English Lexicon (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.