οἰκείως (oikeios)
οἰκείως is an Ancient Greek form of οἰκεῖος, meaning “of the household; one's own”. It is the adverb.
It can also be a form of οἰκειός, “related, familiar; own”.
Found 214 times in the Ancient Greek texts on Socratos.
Where it is used
Thucydides, History of the Peloponnesian War 2.60.6: ὅ τε γὰρ γνοὺς καὶ μὴ σαφῶς διδάξας ἐν ἴσῳ καὶ εἰ μὴ ἐνεθυμήθη· ὅ τε ἔχων ἀμφότερα, τῇ δὲ πόλει δύσνους, οὐκ ἂν ὁμοίως τι οἰκείως φράζοι· προσόντος δὲ καὶ τοῦδε, χρήμασι δὲ νικωμένου, τὰ ξύμπαντα τούτου ἑνὸς ἂν πωλοῖτο.
All forms of οἰκεῖος (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.