What is the greek word for devotion?

The Greek word for devotion is ευσέβεια (eusebeia). It is a compound of the words εὖ (eu), meaning "good", and σέβω (sebo), meaning "to revere" or "to worship". Thus, ευσέβεια can be understood as "good reverence" or "right worship". In ancient Greek religion, ευσέβεια was a highly valued virtue, and was seen as essential for maintaining a good relationship with the gods.