McGraw-Hill dictionary of chemistry, 2003 (analytical chemistry: The branch of chemistry dealing with techniques which yield any type of information about chemical systems)

Analytical chemistry, via American Chemical Society website, Aug. 10, 2020 (Analytical chemistry is the science of obtaining, processing, and communicating information about the composition and structure of matter. In other words, it is the art and science of determining what matter is and how much of it exists. In 2012 (salary survey data), analytical chemistry was the most popular field of work for ACS chemists. Analytical chemists use their knowledge of chemistry, instrumentation, computers, and statistics to solve problems in almost all areas of chemistry and for all kinds of industries. For example, their measurements are used to assure the safety and quality of food, pharmaceuticals, and water; to assure compliance with environmental and other regulations; to support the legal process; to help physicians diagnose diseases; and to provide measurements and documentation essential to trade and commerce)

Webster's new world college dictionary, ©2010, via Collins dictionary website, Aug. 10, 2020 (analytical chemistry: a branch of chemistry that deals with the identification of compounds and mixtures (qualitative analysis) or the determination of the proportions of the constituents (quantitative analysis): techniques commonly used are titration, precipitation, spectroscopy, chromatography, etc.)

Dictionary.com, Aug. 10, 2020 (analytical chemistry: the subdivision of chemistry dealing with the qualitative and quantitative determination of chemical components of substances)

A dictionary of chemistry, 2020