exogamy

n.

1. The custom of marrying outside the tribe, family, clan, or other social unit.
2. Biology. The fusion of two gametes that are not closely related.

exogamic ex'o·gam'ic (ĕk'sə-găm'ĭk) or ex·og'a·mous (ĕk-sŏg'ə-məs) adj.

[Ge]

A rule requiring marriage outside one's own social or cultural unit. Compare endogamy.

Protozoan fertilization by union of elements that are not derived from the same cell.

relating to or characterized by marriage outside a specific group, especially as required by custom or law