Plain English Meaning
It's the modern setup where all the cockpit's flight, navigation, and engine information runs through one connected system and shows up on large glass screens, instead of each instrument being its own separate box.
Full Definition
An avionics architecture in which navigation, communication, flight instruments, autopilot, and engine displays are combined into a single, interconnected system driven by shared computers and displays, rather than installed as separate, standalone units.
Context Anchor
Seen when using modern flight displays and navigation databases, especially when selecting, loading, or checking instrument procedures in the cockpit.
Derivation
Integrated' comes from the Latin integrare, meaning 'to make whole.' The point is that the avionics are not a collection of separate parts — they are wired and programmed to work together as one system, sharing across displays and functions.