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In page Systematics:

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For example, Webster's 9th New Collegiate Dictionary of 1987 treats "classification", "taxonomy", and "systematics" as synonyms. According to this work, the terms originated in 1790, c. 1828, and in 1888 respectively. Some claim systematics alone deals specifically with relationships through time, and that it can be synonymous with phylogenetics, broadly dealing with the inferred hierarchy[citation needed] of organisms. This means it would be a subset of taxonomy as it is sometimes regarded, but the inverse is claimed by others.