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So many different things depending on the context of the science.

In Biology: Which kingdom an animal belongs to in order to qualitative its biological characteristics and/or behavior. For example: Mammals, amphibians, vertebrates, invertebrates, anthropods.

In Chemistry: To classify chemicals with similar characteristics, such as in the Periodic Table. Group I Alkalis, Group II, Alkaline Earth Metals, Transition Metals, VII Halogens, VIII Inert gases.

In Physics: Families of particles: leptons (electrons, quarks), mesons (pi), bosons.

So briefly, 'class' is putting a wide sample of something into smaller categories which share similar characteristics.

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14y ago

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