outbreeding

The breeding or mating of distantly related or unrelated individuals.

The intentional breeding of distantly related or unrelated individuals for the purpose of producing offspring of superior quality.

In biology, the crossing of a pure strain of organisms with members of another strain or of the same strain from another locality.

In ethnology, the custom of intermarrying or interbreeding outside the tribe.

The breeding of unrelated (or only distantly related) individuals

The mating of people from different groups (especially as a result of social proscription)