Matthew 2:12

χρηματισθέντες κατʼ ὄναρ, ‘divinely warned by a dream.’ χρηματίζειν. (1) ‘To transact business,’ ‘to deal or act or confer’ with any one. (2) Of divine dealings with men, ‘to answer,’ ‘warn’ or ‘command,’—a late use frequent in Diod. Sic., Plutarch and Polyb., e.g. θεοὺς αὐτοῖς ταῦτα κεχρηματικέναι. Diod. Sic., I. 177. Hence ὁ χρηματισμός (Romans 11:4), ‘the divine word,’ ‘the oracle.’ With Diod. Sic. who retains the classical use of χρησμός, χρηματισμὸς = ‘a judicial decree.’ (3) From the notion of transacting business under a particular name χρηματίζειν has the meaning of ‘to assume a title,’ ‘to be named,’ τὸ λοιπὸν ἐχρημάτισε βασιλεύς. Diod. Sic. XX. 789. βασιλεὺς ἐτόλμιζε χρηματίζειν. Polyb. 2:57. 5. χρηματίσαι τε πρώτως ἐν Ἀντιοχείᾳ τοὺς μαθητὰς Χριστιανούς. Acts 11:26. Hence still later χρηματισμὸς means ‘a name.’ (4) In modern Greek χρηματίζειν is used for the substantive verb ‘to be.’

κατʼ ὄναρ. See ch. Matthew 1:20.