Lock

The word lock came from Anglo-Saxon loca = "a secure enclosure".

The term lock may refer to:

lock (device), a mechanical device used to fasten a door for example.
lock (firearm), the ignition mechanism used on early projectile weapons
canal lock, an enclosure in a canal used to raise or lower the water level for ships passing through
lock (computer science), a bookkeeping object associated with a piece of data that is used to serialize concurrent access
Lock (Saga of the Skolian empire), a sentient machine in the novels by Catherine Asaro
Goldilocks, and the three bears
A tuft or small bundle of hair.
A wrestling hold, such as a head lock.
One of the rugby union positions or rugby league positions
Lock occurs when the output data and clock signals match those of an input signal transmitted and sent through a bit synchronizer, a device that establishes a series of clock pulses which are synchronous to the incoming signal.
Lock when used in the context of spacecraft can mean a positional fix on another object, or it can mean lock on telemetry data.