IPA: /ˈlɒkˌsɛt/
KK: /ˈlɑkˌsɛt/
A collection of parts used to lock or secure a door, including the lock, handle, and other necessary components.
The contractor installed a new lockset on the front door for better security.
Lockset → It is formed from "lock" (from Old English *locc*, meaning to fasten or secure) and "set" (from Old English *settan*, meaning to place or put). A lockset refers to a set of devices used to secure a door or entry point.
Think of a 'lock' that 'fastens' something and a 'set' that 'places' it in position — together, they create a system to secure an entry.