ascesis
noun
as·ce·sis ə-ˈsē-səs 
variants or less commonly askesis
ə-ˈskē-səs
plural asceses ə-ˈsē-(ˌ)sēz also askeses ə-ˈskē-(ˌ)sēz
also askeses ə-ˈskē-(ˌ)sēz : self-discipline, asceticism
Word History
Etymology
Late Latin or Greek; Late Latin, from Greek askēsis, literally, exercise, from askein
First Known Use
circa 1797, in the meaning defined above