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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

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

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