Definition of "keyholder"

One who holds the key to a building etc. for security reasons.  examples

(cryptography) The individual or organisation with access to a cryptographic key.  examples

A device or component for holding a key.  quotations  examples

(BDSM) A dominant partner who controls whether their submissive partner is able or allowed to orgasm or receive sexual stimulation, typically by locking the submissive partner in a chastity belt or chastity cage.  examples