Dictionary entry

σύμφωνος

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament with Strong's

σύμφωνος, -ον

(< σύν, φωνή), [in LXX: Ec 7:15 (14) (לְעֻמַּת), IV Mac 7:7 14:7 *;]

agreeing in sound. Metaph., harmonious, agreeing: ἐκ συμφώνου (for exx. from π., v. Deiss., BS, 255), by agreement, I Co 7:5.†