[σύμφωνος] from G4862 and G5456; sounding together (alike), i.e. (figuratively) accordant (neuter as noun, agreement)
Usages throughout the bible
1 Corinthians 7:5
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Defraud ye not one the other, except it be with consent G4859 for a time, that ye may give yourselves to fasting and prayer; and come together again, that Satan tempt you not for your incontinency.