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Wiktionary
passthrough

n. The act or process of pass through, especially of a signal through a device or network.

Wikipedia
Passthrough

In signal processing, a passthrough is a logic gate which enables a signal to "pass through" unaltered, sometimes with little alteration. Sometimes the concept of a "passthrough" can also involve daisy chain logic.

Usage examples of "passthrough".

There was a heavy mesh screen in front of the counter, with a passthrough window blocked by a piece of polished cedar.