Castilian Definition
 kă-stĭlyən 
    noun
  
 A native or inhabitant of Castile.
 American Heritage 
A person born or living in Castile.
 Webster's New World 
The variety of Spanish spoken in Castile, now the standard form of the language in Spain.
 Webster's New World 
The Spanish dialect of Castile.
 American Heritage 
    adjective
  
 Of Castile or its people, language, or culture.
 Webster's New World 
    pronoun
  
 The main and official language of Spain, Peru, Colombia, Chile, Argentina, Ecuador, Mexico, etc.
Wiktionary 
Other Word Forms of Castilian
Noun
Singular:
 CastilianPlural:
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