kingdom /ˈkɪŋdəm/noun 3forms 1phrases 2 noun3 •a country with a royal ruler, even if that ruler has little real powerIn 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. — 1956 •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. — 1839 •A realm, region, or conceptual space where something is dominant.the kingdom of thought formskingdoms Phrases with kingdom blow to kingdom comeTo totally destroy (something); to annihilate or wipe out (something), often via an explosion. keys to the kingdomA resource, usually information or knowledge, the possession of which gives the possessor access to power.