(graph theory) an Eulerian trail that begins and ends at the same node

(mathematics) The number of independent cycles in a graph

(rail transport) an electrical circuit in a railway track used for signalling purposes.

plural of track circuit

plural of circuit slugger

(UK, law, historical) The southeastern circuit of assize, including the Home Counties (except Middlesex) and Cambridgeshire, Norfolk, and Suffolk.

plural of circuit rank

plural of circuit party

(LGBT) A large dance event closely associated with LGBT culture, often extending through the night into the following day, usually with a number of affiliated events in the days leading up to and following the main event.

(historical) The practice of entertainers visiting troops where they were stationed and performing for them there.