ascesis

The story

1. Ancient Greek · borrowed fromἄσκησις“exercise, training”
2. Late Latin · learned borrowing fromascesis
3. English todayascesis

Learned borrowing from Late Latin ascesis, or directly from its etymon, Ancient Greek ἄσκησις (áskēsis, “exercise, training”), from ἀσκέω (askéō, “to exercise, practise, train”) + -σῐς (-sĭs, suffix forming abstract nouns or nouns of action, result or process).