taxonomy
US /tækˈsɑː.nə.mi/
UK /tækˈsɑː.nə.mi/

1.
the branch of science concerned with classification, especially of organisms; systematics.
:
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The taxonomy of plants is a complex field.
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He specializes in the taxonomy of insects.
2.
a scheme of classification.
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The new taxonomy for digital assets is still under development.
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We need to establish a clear taxonomy for our data.