noun — 2 senses
Etymology Named after its two electrical connections.
Business, Electrical engineering, Electricity, Electromagnetism, Energy, Engineering, Natural sciences, Physical sciences, Physics US, Rare A plain type of light switch that can control lights, or other electrical loads, from a single location; a single-throw switch.
Etymology Named after its use in pairs to control a load from two locations.
Business, Electrical engineering, Electricity, Electromagnetism, Energy, Engineering, Natural sciences, Physical sciences, Physics UK Commonwealth spelling of (US): three-way switch.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.