Henceforth

henceforth
hence‧forth /ˌhensˈfɔːθ, ˈhensfɔːθ $ -ɔːrθ/ (also hence‧for‧ward /ˌhensˈfɔːwəd $ -ˈfɔːrwərd/) adverb formal
from this time on:
    multiple sclerosis (henceforth referred to as MS)