From G1909 (epi, upon) and a derivative of G1062 (gamos, marriage). A technical term for levirate marriage — the obligation of a brother-in-law to marry his deceased brother's childless widow to raise up offspring in the dead brother's name (Deuteronomy 25:5-6). Jesus uses this concept in His debate with the Sadducees about resurrection.
The Sadducees presented Jesus with a riddle about seven brothers who each married the same woman through epigambreuo (Matthew 22:24). Their intent was to make resurrection seem absurd. Jesus's response shattered their framework: 'In the resurrection they neither marry, nor are given in marriage, but are as the angels of God in heaven.' The theological depth: the levirate law was designed to preserve a name and inheritance in this age. But in the resurrection, identity and inheritance are secured eternally in God — making the earthly mechanism obsolete. The temporary points to the permanent.