Plain English Meaning
It is a visibility reading taken near the far end of the runway, telling pilots how clearly they will be able to see while slowing down after landing.
Full Definition
The Runway Visual Range value reported from a sensor located near the rollout end of the runway, indicating the visibility distance along the final portion of the runway used by an aircraft after touchdown.
Context Anchor
Seen in instrument approach minimums, low-visibility landing reports, and airport weather information for runways equipped with more than one RVR .