Technical term in biology and anthropology for mating or reproduction between individuals of different genetic lines, populations, or social groups.
Outbreeding increases genetic diversity.
Exogamy is traditionally practiced in that tribe.
近親交配 (inbreeding) is the opposite of 異系交配, referring to mating between close relatives.
交配 is a broader term for mating or crossbreeding, while 異系交配 specifically emphasizes crossing between different lines or groups.
Compound of 異系 (different lineage) and 交配 (mating/crossing). The exact historical derivation is uncertain, but the term is a modern technical coinage.