A Je'daii was a member of the Je'daii Order, an organization of Force-users on the planet Tython which existed millennia before the Galactic Republic. The term "Je'daii" could apply to members of any rank. They focused on maintaining a balance in the Force.
The Je'daii saw the Force as three aspects of a whole: the Ashla (light), the Bogan (dark), and the Bendu (balance).