kingdom

(kĭngˈdəm)

1. A political or territorial unit ruled by a sovereign.
2. a. The eternal spiritual sovereignty of God or Christ.
   b. The realm of this sovereignty.
3. A realm or sphere in which one thing is dominant: the kingdom of the imagination.
4. One of the three main divisions (animal, vegetable, and mineral) into which natural organisms and objects are classified.
5. In the Linnaean taxonomic system, the highest taxonomic classification into which organisms are grouped, based on fundamental similarities and common ancestry. The Linnaean system designates five such classifications: animals, plants, fungi, prokaryotes, and protoctists. See Table at taxonomy.