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classification US English

The action or process of classifying something according to shared qualities or characteristics

classification US Thesaurus

the classification of diseases

classification society US English

An organization which examines the design and construction of ships in order to classify them on the basis of quality, safety, etc.

decimal classification US English

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.

Harvard classification US English

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

Hubble classification US English

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

natural classification US English

A scientific classification according to features that are held to be objectively significant, rather than being selected for convenience

periodic classification US English

The classification of the chemical elements according to the periodic law.

Dewey Decimal Classification US English

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

universal decimal classification US English

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.

reclassification US English

Assignment to a different class or category