QUASI-AFFINITY. A term used in the civil law to designate the affinity which
exists between two persons, one of whom has been betrothed to the kindred of
the other, but who have never been married. For example, my brother is
betrothed to Maria, and, afterwards, before marriage he dies, there then
exists between Maria and me a quasi-affinity.
2. The history of England furnishes an example of this kind. Catherine of Arragon was betrothed to the brother of Henry VIII. Afterwards Henry married her and, under the pretence of this quasi affinity, he repudiated her, because the marriage was incestuous.