Pronuncation: AH-jah 
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All [Aes Sedai] except the [Amyrlin] Seat belong to an Ajah. Each follows a specific philosophy of the use of the [One Power] and the purposes of the [Aes Sedai]. There are seven official Ajahs, each designated by a color. The eighth, unofficial Ajah, is the [Black Ajah] (spoilers).

Each Ajah has its own organization and communications network including a spy network called the "eyes-and-ears". Curiously, the head of each Ajah is a closely guarded secret within the Ajah and the Ajah head is typically not a [Sitter|Sitters].