Kinktionary
More like guidelines and a lot less like definitions.
Chastity
This is abstinence from certain sexual activity enforced through equipment (chastity belts or cages) that confine and restrict access to and use of the wearer's genitals. Equipment is available for all genital types.
This equipment is often locked, and so a Top role in this activity is called a Key Holder.
The main symbolic purpose of chastity is to humble the wearer through loss of agency over their sexual activities. The main effect of chastity on the wearer is to increase sexual frustration which can affect sexual and power dynamics (e.g. through increased arousal levels and attention).
In chastity enclosing the penis and genital confinement is often linked with symbolic/attempted shrinking of the penis (see penis shrinking).