A black box is an electronic device in an aircraft which records information about its flights. Black boxes are often used to provide evidence about accidents.
2. countable noun [usually singular]
You can refer to a system or device as a black box when you know that it produces a particular result but you have no understanding of how it works.
They were part of the black box associated with high-flyer management development.
black box in British English
noun
1.
a self-contained unit in an electronic or computer system whose circuitry need not be known to understand its function
2. an informal name for flight recorder
3. informal
an electronic device fitted to a motor vehicle for recording information relating to how it has been driven
black box in American English
1.
an intricate, compact electronic component or device, such as a flight recorder, that can be quickly connected or disconnected as a unit
2.
anything having a complex function that can be observed but whose inner workings are mysterious or unknown