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suggested by Acadēmīa

Noun [Cite]

(Classical) IPA^(key): /ˈreːɡ.num foe̯.deˈraː.tum/, [ˈreːŋnʊ̃ˑ foe̯d̪ɛˈräːt̪ʊ̃ˑ]
(Ecclesiastical) IPA^(key): /ˈreɲ.ɲum fe.deˈra.tum/, [ˈrɛɲːum fed̪eˈräːt̪um]

Declension

Second-declension noun (neuter) with a second-declension noun (neuter), singular only.

Note:

We chose "Foederātum Rēgnum Britanniae et Hiberniae septentriōnālis" instead of "Britannia" to refer to the state rather than the island.

References:

"Britannia". In: Wiktionary, Wikimedia Foundation, visited on 29.01.2023
"Britanniarum regnum". In: Vicipaedia, Wikimedia Foundation, visited on 29.01.2023‎

Noun [Cite]

(Classical) IPA^(key): /ˈreːɡ.num foe̯.deˈraː.tum briˈtan.ni.ae̯ mai̯ˈi̯oː.ris et hiˈber.ni.ae̯ sep.ten.tri.oːˈnaː.lis/, [ˈreːŋnʊ̃ˑ foe̯d̪ɛˈräːt̪ʊ̃ˑ brɪˈt̪änːiäe̯ mäi̯ˈi̯oːrɪs̠ ɛt̪ hɪˈbɛrniäe̯ s̠ɛpt̪ɛn̪t̪rioːˈnäːlʲɪs̠]
(Ecclesiastical) IPA^(key): /ˈreɲ.ɲum fe.deˈra.tum briˈtan.ni.e maˈjo.ris et iˈber.ni.e sep.ten.tri.oˈna.lis/, [ˈrɛɲːum fed̪eˈräːt̪um briˈt̪änːie mäˈjɔːris ɛt̪ iˈbɛrnie sept̪en̪t̪rioˈnäːlis]

Meaning:

Declension

Second-declension noun (neuter) with a second-declension noun (neuter) with an indeclinable portion, singular only.

Case	Singular
Nominative	Rēgnum Foederātum Britanniae Majōris et Hiberniae Septentriōnālis
Genitive	Rēgnī Foederātī Britanniae Majōris et Hiberniae Septentriōnālis
Dative	Rēgnō Foederātō Britanniae Majōris et Hiberniae Septentriōnālis
Accusative	Rēgnum Foederātum Britanniae Majōris et Hiberniae Septentriōnālis
Ablative	Rēgnō Foederātō Britanniae Majōris et Hiberniae Septentriōnālis
Vocative	Rēgnum Foederātum Britanniae Majōris et Hiberniae Septentriōnālis

References:

"Britanniarum regnum". In: Vicipaedia, Wikimedia Foundation, visited on 29.01.2023‎