The system of electrical circuits inside a device, including the paths and electronic parts that let electricity flow and do work. It is what makes electronic devices like phones and computers function.
From "circuit," from Latin "circuitus" meaning "a going around" (from "circum" meaning "around" and "ire" meaning "to go"). "Circuitry" is a modern extension referring to the network of these "go-around" paths for electricity.
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