Abbott-Smith Manual Greek Lexicon
σύμφωνος (G4859)
1 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 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain