
In computing, input/output or I/O (or informally, io or IO) is the communication between an information processing system (such as a computer) and the outside world, possibly a human or another information processing system. Inputs are the signals or data received by the system and outputs are the signals or data sent from it. The term can also be...
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http://en.wikipedia.org/wiki/Input/output

Input/Output (I/O) Ports on a reader. Users can connect devices; such as, an electronic eye to the input port so that when an object breaks the beam of the electronic eye the reader begins reading. Devices can also be connected to an output part, so that when a tag is read, a conveyor is turned on or a dock door opened.
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http://www.wordinfo.info/words/index/info/view_unit/3991/5

the process of input or output, encompassing the devices, techniques, media, and data used: A good first step in designing a program is to define the input/output.
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https://www.infoplease.com/dictionary/inputoutput
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