G4859 σύμφωνος (sýmphōnos)

KJV renderings: consent
Strong's definition: sounding together (alike), i.e. (figuratively) accordant (neuter as noun, agreement)
Derivation: from G4862 (σύν) and G5456 (φωνή);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.