askesis

/ษ™หˆskiหsษชs/
noun
  1. 1

    (Rigorous) self-discipline, particularly as a religious observance; asceticism.

  2. 2

    (specifically) The praxis or "exercise" of asceticism and self-denial of impulses or passions for the sake of piety, theosis, and connection with God.

Source: https://en.wiktionary.org/wiki/ascesis, https://en.wiktionary.org/wiki/askesis