Different understanding of Motherboard between flexible PCB engineers with new guys

This paper will focus on discuss Different understanding of Motherboard between flexible PCB engineers with new guys.

The name of Mother Board

Motherboard, also called Backpanel, Backplane, back plane, or matrix board.
In engineer communication, usually use mother board.

The definition of Mother Board

For normal people, the definition of mother board is below:
The back panel is the portion of the motherboard that allows you to connect external devices such as your monitor, speakers, keyboard, and mouse.

The understanding of Mother board in flexible PCB engineers

In flexible PCB engineers dictionary, Motherboard is a connect method.
A relatively large printed circuit board on which modules, connectors, sub-assemblies or other printed circuit boards are mounted and interconnections made by means of traces on the board.
motherboard