Plain English Meaning
It is the live picture from the EFVS sensors, shown to the pilot as it happens, so what they see on the display matches what is actually outside the aircraft at that moment.
Full Definition
A live, continuously updated sensor-based view of the scene ahead of the aircraft, displayed by an Enhanced Flight Vision System (EFVS) with negligible delay between what the sensor detects and what the pilot sees. The imagery typically comes from infrared or other imaging sensors and is shown on a head-up display or equivalent, allowing the pilot to use it as a primary visual reference for the approach, landing, and rollout in low-visibility conditions.
Context Anchor
Seen in instrument approach and combined vision system discussions, especially when EFVS information is shown on a display during - operations.