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alienation of affection

Definition of alienation of affection 

: the diversion of a person's affection from someone who has certain rights or claims to such affection to a third person who is held to be the instigator or cause of the diversion

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First Known Use of alienation of affection

1647, in the meaning defined above

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Time Traveler for alienation of affection

The first known use of alienation of affection was in 1647

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