Strong’s Greek
G4859 — sumphonos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
σύμφωνος
sumphonos — pronounced soom'-fo-nos
from 4862 and 5456; sounding together (alike), i.e. (figuratively) accordant (neuter as noun, agreement):-- consent. see GREEK for 4862 see GREEK for 5456
1 occurrence in the KJV.
1 Corinthians 7:5
Defraud ye not one the other, except it be with consent for a time, that ye may give yourselves to fasting and prayer; and come together again, that Satan tempt you not for your incontinency.