Commonwealth realm
A political term referring to a sovereign state within the Commonwealth of Nations that recognizes the British monarch as its head of state. Used in formal or academic contexts.
See also: 英連邦 (えいれんぽう)
Canada is one of the Commonwealth realms.
英連邦 (Commonwealth of Nations) is the broader organization; 英連邦王国 specifically refers to member states that have the British monarch as head of state.
Compound of 英 (England/Britain), 連邦 (federation/commonwealth), and 王国 (kingdom). The term is a direct translation of 'Commonwealth realm'.