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An auxiliary lock is specifically designed to provide additional security beyond what the primary lockset offers. This type of lock is typically installed alongside the main locking mechanism to reinforce the overall security of a door or entry point. The auxiliary lock can serve various purposes, such as reinforcing the door against forced entry or providing extra mechanisms such as deadbolts or slide bolts that enhance the locking system's effectiveness.

The term "supplementary lock" is not commonly used in a professional or technical context when discussing locks; it may imply something additional but does not specifically denote a type of lock recognized within standard locksmith terminology. "Secondary lock" could confuse people, as it might refer to any lock that isn’t the main one; however, it does not have the same established connotation as auxiliary lock, which clearly indicates its purpose. Conversely, "primary lock" refers to the main locking device on a door, not an additional security layer, which further distinguishes it from the concept of an auxiliary lock.

Thus, auxiliary lock accurately describes an additional locking mechanism specifically meant to enhance security, clarifying the role it plays in a complete locking system.