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English word kingdom comes from Proto-Germanic *kuningaz (king) and Proto-Germanic -dōmaz (denoting a condition or state of the suffixed word)
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*kuningaz (Proto-Germanic)
King.
-dōmaz (Proto-Germanic)
Forms nouns denoting the condition or state of the suffixed word.
*kuningadōmaz (Proto-Germanic)
Realm, kingdom.
cyningdom (Old English)
Kingdom, kingly power.
kyngdom (Middle English)
Kingdom.
kingdom (English)
A realm having a king and/or queen as its actual or nominal sovereign.. A realm, region, or conceptual space where something is dominant. (taxonomy) 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)..