- noun headphones, often with a small microphone to enable two-way communication
- noun the part of a radio or other audio-equipment, consisting of a set of earphones, sometimes with a microphone attached for speaking, which is worn on the head and is used to listen to transmissions or signals
- noun someone’s attitude, way of thinking. This version of the colloquial ‘mindset’, punning on headset as, e.g., a virtual reality helmet, is heard in British campus slang. It may have originated in the jargon of psychotherapy.