Castella et Legio

Calque of Spanish Castilla y León, from Castella (“Castile”) +‎ et (“and”) +‎ Legiō (“León”)

• (Classical Latin) IPA^(key): [kasˈtɛl.la ˈɛt ˈɫɛ.ɡi.oː]
• (modern Italianate Ecclesiastical) IPA^(key): [kasˈt̪ɛl.la ˈɛt̪ ˈlɛː.d͡ʒi.o]

Castella et Legiō f sg (genitive Castellae et Legiōnis); variously declined, first declension, third declension

1. (Medieval Latin, New Latin) Castile and León (the largest of the autonomous communities of Spain, in the central north of the country)

First-declension noun with an indeclinable portion with a third-declension noun, singular only.