classification
US /ˌklæs.ə.fəˈkeɪ.ʃən/
UK /ˌklæs.ə.fəˈkeɪ.ʃən/

1.
the arrangement of animals and plants in taxonomic groups according to their observed similarities
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The classification of species is a fundamental aspect of biology.
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Linnaeus developed a system for the classification of living organisms.
2.
the action or process of classifying something
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The library uses a decimal system for the classification of books.
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Data classification is crucial for effective data management.