Late 16th century; earliest use found in John Florio (1553–1625), author and teacher of languages. From predominant: see -ancy. Compare post-classical Latin praedominantia.
Definition of predominancy in US English:
predominancy
nounprɪˈdɒmɪnənsi
Predominance.
Origin
Late 16th century; earliest use found in John Florio (1553–1625), author and teacher of languages. From predominant: see -ancy. Compare post-classical Latin praedominantia.