black box

¹black box

noun

Definition of BLACK BOX

1

: a usually complicated electronic device whose internal mechanism is usually hidden from or mysterious to the user; broadly : anything that has mysterious or unknown internal functions or mechanisms

2

: a crashworthy device in aircraft for recording cockpit conversations and flight data

Examples of BLACK BOX

1. The black boxes were recovered from the crash site and provided useful information about the cause of the crash.

First Known Use of BLACK BOX

circa 1945

Rhymes with BLACK BOX

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