Alienation of affections

: the diversion of a person's affection from someone (as a spouse) who has certain rights or claims to such affection usu. to a third person who is held to be the instigator or cause of the diversion
compare criminal conversation
In most jurisdictions alienation of affections is no longer recognized as a basis for a civil suit.

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Based on Merriam-Webster's Dictionary of Law ©2001.
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