askesis

[ uh-skee-sis ]
/ əˈski sɪs /

noun, plural as·ke·ses [uh-skee-seez] /əˈski siz/.

strict self-discipline or self-control, as for religious or meditative purposes.
Also ascesis.

Origin of askesis

1870–75; Greek askēsis exercise, training, equivalent to askē- (variant stem of askeîn to practice, train) + -sis -sis