I/O device

noun

plural I/O devices

computing : a peripheral that transmits input to or output from a computer's central processor

… user interface I/O devices (such as monitors, keyboard, and mouse) …

—Samuel A. Recine and Liv Stewart

I/O devices have been something of a mystery to many working in digital video. What seems like a simple enough concept—needing a device to get video in or out of a computer—can lead to a multitude of devices with a massive number of features.

—Odin Lindblom

Word History

First Known Use

1961, in the meaning defined above