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1. in the classification of living organisms, the highest of the categories; the most widely used classification system lists five kingdoms: monera, protista, fungi, Planta (the plants, and Animalia (the animals).
2. traditionally, one of three major categories into which natural objects may be classified, consisting of the animal, plant, and mineral kingdoms.
The highest taxonomic category into which living forms are classified, comprising Monera (bacteria and blue-green algae), Protista (protozoa and eukaryotic algae), Fungi (fungi), Plantae (plants), and Animalia (animals).
[A.S. cyningdōm, fr. cyning, king, + -dom, state, condition]
1. In the Linnean taxonomic system, the highest taxonomic category into which organisms are grouped, based on fundamental similarities and common ancestry. One widely used taxonomic system designates five or six such groups: animals, plants, fungi, protists, and prokaryotes (often divided into bacteria and archaea). Other systems divide organisms into domains (eukaryotes, bacteria, and archaea) that replace or rank above kingdoms.
2. One of the three main divisions (animal, vegetable, and mineral) into which natural organisms and objects have traditionally been classified.