heterogeny

noun

het·​er·​og·​e·​ny ˌhe-tə-ˈrä-jə-nē 

: a heterogeneous collection or group

Word History

Etymology

heterogen(eous) + -y entry 2

Note: Compare French hétérogénie, attested slightly earlier, though this word is not used in the same sense.

First Known Use

1838, in the meaning defined above