1. devices that connect or join two things together
2. mechanical devices that connect railroad cars together
Usage: railroad terminology
3. electronic components that transfer signals between circuits
Usage: electronics

Examples

• The train engineer checked all the couplers before departure.
• These fiber optic couplers allow signals to pass between cables.
• The old railroad used manual couplers that required workers to stand between cars.
• Electronic couplers help isolate sensitive equipment from power surges.
• The mechanic replaced the worn couplers on the freight train.
• Optical couplers are essential components in telecommunications systems.