- a listening device consisting of a single small speaker held to the ear by a band over the head
- a listening device consisting of two such speakers
A small speaker that is worn over or in the ear, often as one of a pair connected by a wire attached to a band running over the head
- A listening device placed or worn in the ear, usually sold in pairs
- She handed me one headphone so I could listen too.
Also used as a noun modifier: e.g. headphone plug, headphone socket.