Plain English Meaning
The point on a precision approach where the pilot has to make a call: if they can see the runway environment clearly, they can keep going down to land. If they can't, they must climb away and try again or divert.
Full Definition
On a precision instrument approach, the height above the runway touchdown zone elevation at which the pilot must decide whether to continue the approach to land or execute a missed approach. The decision is based on whether the required visual references for the intended runway are distinctly visible and identifiable.
Context Anchor
Seen on instrument approach information, including precision radar approaches, where the guides the down toward the runway.