Gentling is

"the act, performed by Aes Sedai, of shutting off a male who can channel from the One Power...A man who has been gentled can still sense the True Source, but he cannot touch it." (The Eye of the World,Glossary)

Stilling is

"the act, performed by Aes Sedai, of shutting off a female who can channel from the One Power...A woman who has been stilled can still sense the True Source, but she cannot touch it." (The Eye of the World,Glossary)

References (Possible Spoilers)#

  1. In The Shadow Rising
    1. TSR,Ch5 - Stilling cannot be Healed. Women who are stilled seldom live more than a few years.
  2. In The Fires of Heaven
    1. TFoH,Ch6 - In the Age of Legends it was called severing. Lanfear tells Rand that Asmodean severed his own mother.
  3. In Lord of Chaos
    1. LoC,Prologue - In the Age of Legends, it was referred to as severing.
  4. In A Crown of Swords
    1. ACoS,Prologue - Alviarin Freidhen does not believe that stilled women can ever survive for long.
    2. ACoS,Ch25 - Moghedien recalls the being severed is supposed to be the deepest pain one can know.
  5. In Crossroads of Twilight
    1. CoT,Ch23 - Cadsuane helped Emarin survive ten years after he was gentled.