Castilian is a noun and adjective that refers to the region and former kingdom of Spain; in particular, it refers to the language of this region, and is therefore considered by many to be a synonym of Spanish, though with different nuances. Please refer to the following articles for further information.
Castile, for information on the region and its people.
Spanish language, for general information on the language including dialectal variation in Castile, the rest of Spain and Spain's former colonies.
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The term “CastilianSpanish”; could be used in three different ways: as the Spanish dialect for the region of Castilla in Spain, as the Spanish spoken in Spain or as the neutral Spanish understood in all Spanish-speaking countries.