Linking

From A Wheel of Time Wiki

Linking is the act of two or more Aes Sedai joining together to share their powers between them. One of the Aes Sedai leads, while the others are simply used as conduits to allow the lead Aes Sedai to draw a much larger amount of the Power than if the Aes Sedai was alone. Both men and women can link together, though this had not happened since The Breaking, until the time of some of these books.