Plain English Meaning
The part of the runway, starting at the near end, where you are supposed to land. It is the first 3,000 feet past the runway threshold.
Full Definition
The first 3,000 feet of the runway beginning at the threshold, used for landing performance calculations and as the intended area for an aircraft's wheels to first contact the runway.
Context Anchor
You will see this term in runway marking discussions, landing performance planning, approach briefings, and airport information.
Derivation
Combines 'touchdown,' referring to the moment wheels contact the surface, with 'zone,' meaning a defined segment. This clarifies the term refers to a specific measured portion rather than any random of contact.