Definition of faciation in English:

faciation

Pronunciation /ˌfeɪsɪˈeɪʃən/

noun

Ecology
  • A division of a climax association containing more than one of the dominant species of the association.

    The differences in species composition of different faciations are often related to climatic or geographic variation over the area of the association.

Origin

1920s; earliest use found in Frederic Edward Clements (1874–1945). From classical Latin faciēs face + -ation.