kingdom

noun

1. A realm having a king or queen as its actual or nominal sovereign.

   “In 1924 the Hashemite King Hussein was driven out of the Hedjaz by Ibn Saud, and a state of war sprang up between the new kingdoms of Saudi Arabia and Trans-Jordan.”

   “A few other key remappings occur when you use the United Kingdom country...”

   “‘Lucknow is not a village. It is a city with a thousand years of civilization. It was the capital of the Awadh kingdom.ʼ”

2. A realm, region, or conceptual space where something is dominant.

   “the kingdom of thought”

   “the kingdom of the dead”

3. A rank in the classification of organisms, below domain and above phylum; a taxon at that rank (e.g. the plant kingdom, the animal kingdom).

   “The Organized and inorganized kingdoms are distinguished from each other by peculiarities of chemical composition, of form and structure, and of actions or functions.”

   “It has micobiont from Ascomycota and Basidiomycota belonging to kingdom Fungi and photobiont from Trebouxia species.”