The action or process of classifying something according to shared qualities or characteristics
the classification of diseases
An organization which examines the design and construction of ships in order to classify them on the basis of quality, safety, etc.
A classification in which items are assigned a decimal number, each digit representing a particular class or subclass to which an item can be assigned.
A system of classification of stars based on their spectral types, the chief classes (O, B, A, F, G, K, M) forming a series from hot bluish-white stars to cool dull red stars
A simple method of describing the shapes of galaxies, using subdivisions of each of four basic types (elliptical, spiral, barred spiral, and irregular). Hubble’s suggestion that they form an evolutionary sequence is no longer accepted
A scientific classification according to features that are held to be objectively significant, rather than being selected for convenience
The classification of the chemical elements according to the periodic law.
An internationally applied decimal system of library classification that uses a three-figure code from 000 to 999 to represent the major branches of knowledge, and allows finer classification to be made by the addition of further figures after a decimal point
A form of library classification based on the Dewey decimal system with auxiliary symbols (as +,/, etc.) allowing a document to be classified under a combination of different categories; abbreviated U.D.C.
Assignment to a different class or category