What does "synoptic" mean in avionics? I came across a mention of a display of "graphical aircraft system synoptics" on this page.  I think in context that it means "status display" or "summary page"- the page that shows flap position, hydraulic pressure, etc. 

However, synoptic isn't even a noun in some dictionaries. Google searches for the word turned up only passing references to the term, not a solid definition. The actual word usage seems very aviation-specific.  What does the term actually mean and how does it differ from "system status" or "summary page?"
Synoptic refers to the active system diagrams that are selectable, usually on one of the middle displays above the center console.  If you want to know what the hydraulic system  is up to, you can select the Hydraulic Synoptic and an active diagram of the hydraulic system appears, showing what's pressurized and what's not, valves open and closed, the pressure values, quantities, etc.  There will be one for most of the major systems, hyper simplified compared to a normal system schematic because only the essential information is presented.