What is defined as "Authorization by ATC for a pilot to conduct an instrument approach"?

The definition of "Authorization by ATC for a pilot to conduct an instrument approach" aligns perfectly with the term "approach clearance." This clearance is specifically issued by Air Traffic Control (ATC) to a pilot, granting them permission to begin the instrument approach process to a designated runway.

An approach clearance not only signifies that the pilot can proceed with the approach, but it also incorporates any specific instructions or procedures that must be followed during the approach phase, including altitudes, headings, and any necessary transitions between different segments of the approach. This ensures safe separation from other aircraft and adherence to established safety protocols in controlled airspace.

When an approach clearance is provided, it confirms that the aircraft is in the proper position to begin the descent and approach to landing, ultimately facilitating a structured and organized flow of air traffic, especially in busy terminal areas.