AES SEDAI

Ajahs: In the Age of Legends time period of the Wheel of Time series, an Ajah was a temporary group of people banded together for a specific purpose. In the present, or time period of the main plot of the Wheel of Time, the Ajahs are seven sub-societies among which all Aes Sedai, except for the Amyrlin, of the White Tower are divided. These societies each have representatives in the legislation of the Tower, have personal ideologies, customs and purposes for joining, their own ruling heads, and all except the White have networks of spies.

Only the members of a certain Ajah are supposed to know their head's identity. However, the heads of the Ajahs know each other, but this is not widely known.

Entering an Ajah: traditionally, every sister chooses an Ajah immediately after being raised beyond the rank of Accepted. Egwene al’Vere, the current Amyrlin Seat, never chose an Ajah as she was raised directly from Accepted to Amyrlin without being made Aes Sedai first; according to a technicality in the law it was actually the act of raising her to the Amyrlin Seat itself that made her Aes Sedai.
Ajahs have certain traditions and ceremonies involved in entering them, which aren’t entirely known. Generally Ajahs accept entrance almost immediately; it is however rumoured that some of the Aes Sedai raised by decree of Egwene al’Vere had to beg. Aes Sedai cannot switch Ajahs after being accepted into one; however, when Leane Sharif, a former member of the Blue Ajah, was Stilled and then Healed, she was considered to have lost all titles and right along with the ability to channel. Thus, when she was Healed, she did not resume her position as Aes Sedai but rather regained it, and was allowed to choose a new Ajah, the Green. She and Siuan Sanche are also the only known Aes Sedai to have been raised to the rank twice. Siuan, for her part, chose to return to the Blues.