n.
Pronunciation: ' s ə b- ˌ r ē -j ə n
Function: noun
Etymology: International Scientific Vocabulary
Date: 1864
1 : a subdivision of a region
2 : one of the primary divisions of a biogeographic region
– sub · re · gion · al \ - ˌ r ē j-n ə l, - ˌ r ē -j ə -n ə l \ adjective