1) Cassette 2) Input for a recorder 
(from the article `sound recording`) Audiocassette tape recording also makes use of electromagnetic phenomena to record and reproduce sound waves. The tape consists of a plastic backing ... Audiocassette tape is only 0.15 inch (3.8 millimetres) wide but can carry four to eight tracks. Videocassette tape used in home video recorders is 1...
[n] - a cassette for audio tape
noun a cassette for audio tape