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systematics▼(the systematic classification of organisms)noun[UK: ˌsɪ.stə.ˈmæ.tɪks] [US: ˌsɪ.stə.ˈmæ.tɪks]
taxonomy [taxonomies]▼(classification in a hierarchical system)noun[UK: tæk.ˈsɒ.nə.mi] [US: tæk.ˈsɒ.nə.mi]
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