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Old English cyningdom; see king + -dom. Cognate with Old Saxon kuningdom, Middle Dutch koninghdom, Old Norse konungdomr. The usual Old English word was cynedom; Middle English also had kingrick (for second element, see Reichstag). Meaning "one of the realms of nature" is from 1690s. Kingdom-come "the next world" (1785) is from the Lord's Prayer.
The highest classification into which living organisms are grouped in Linnean taxonomy, ranking above a phylum. One widely accepted system of classification divides life into five kingdoms: prokaryotes, protists, fungi, plants, and animals. See Table at taxonomy.
In biology, the largest of the divisions of living things. The best-known kingdoms are those of the plants and animals. Modern biologists recognize three additional kingdoms: Monera (or Prokaryotae) (for example, bacteria and blue-green algae), Protoctista (for example, red algae, slime molds, and amoebas and other protozoa), and fungi. (See Linnean classification.)