* Noun: This is the most common usage. It refers to a closed loop through which an electric current can flow.
* Example: "The technician checked the circuit for any breaks."
* Adjective: It can describe something that is circular or forms a loop.
* Example: "The circuit board was carefully designed."
* Verb: While less common, it can mean to travel in a circular or looped path.
* Example: "The race car circuited the track for several laps."
So, to determine the part of speech, you need to look at the context of the sentence.