Noun
Commonwealth realm (plural Commonwealth realms)
A member state of the Commonwealth of Nations (as most former British colonial possessions) which is a realm (kingdom) in personal union with the United Kingdom, i.e. has the British Sovereign as its 'shared' head of state, which is usually represented in its capital by a governor general.
From 1900 to 1920, a sleeping sickness epidemic killed more than 250,000 people. citation Independence (1962 to 1965) Uganda gained independence from Britain in October 1962 as a Commonwealth realm with Queen Elizabeth II as head of state. Source: Internet