Solid/Liquid Separation (SLS) is a cross-sectional unit operation which is ubiquitous in all sectors of the process industry as well as in environmental protection. Hence process engineers and experts of different fields are frequently confronted with specific Solid/Liquid-Separation terms and definitions they do not use for their daily business. Very often they require a reference book with explanations and interpretations that are readily understandable.To fulfil this need, BOKELA has assembled a team of authors consisting of academic and industrial experts to compile the 'Solid/Liquid Separation Lexicon'. This work gives a comprehensive survey of the definitions, terminology and concepts introduced by the Karlsruhe (Germany) School for Solid/Liquid-Separation Science. These terms are widely used as a standard and are now largely accepted in the scientific community.