the.com/schematic

means A simplified diagram that shows how a system's parts relate and connect, rather than how they actually look or sit in space.

from Traces back to Greek 'skhēma' meaning form, shape, or figure — the same root behind 'scheme.' By the time it entered English (via Latin 'schema'), it carried the sense of an outline or structured plan rather than a literal picture. 'Schematic' as an adjective/noun describing simplified technical diagrams is a more modern narrowing, tied to engineering and circuit drawings, where showing the logical structure matters far more than showing physical likeness.