means A wide, unbroken view of an entire surrounding area or scene, or by extension a comprehensive survey of a subject.

from Coined around 1789 by the painter Robert Barker for his huge 360-degree cityscapes, stitched together from the Greek 'pan' (all) and 'horama' (a view, a sight) — literally 'a seeing of everything.' Barker's invention was a building: you climbed to a central platform and the painted world wrapped completely around you, no edges in sight.