homogamy

ho·mog·a·my

noun \hō-ˈmäg-ə-mē\

plural ho·mog·a·mies

Definition of HOMOGAMY

: reproduction within an isolated group perpetuating qualities by which it is differentiated from the larger group of which it is a part; broadly : the mating of like with like

—ho·mog·a·mous \-məs\ or ho·mo·gam·ic \ˌhō-mə-ˈgam-ik, ˌhäm-ə-\ adjective