This is a dictionary of terms used in acoustics. It provides in-depth and informative definitions of the terminology and concepts used in acoustics. The terms are in alphabetical order.The science and technology of acoustics embrace an unusually wide range of disciplines, from aircraft noise reduction to ultrasonics in medicine, and from psychoacoustics to signal processing. The student of acoustics must become familiar with a corresponding range of specialist terms in order to communicate with others and to understand the literature. Here, for the first time, in one informative dictionary, are listed authoritative definitions covering most of the relevant fields, apart from music and speech, that the practicing acoustician needs to understand. The author has drawn on experience gained during a long career spent mostly at Southampton University's multidisciplinary Institute of Sound and Vibration Research and has been able to draw on the expertise of specialists in the various fields.The Dictionary of Acoustics is intended as a supplementary text for students students in acoustics, in the departments of Engineering and Physics. The Dictionary of Acoustics is also a valuable quick reference for researchers engineers and physicists in industry and academia who deal with acoustics.