When naming the common language of Spain and of many nations of the Americas, which is also spoken as a first language in other parts of the world, the terms Castilian and Spanish are [both] valid. The debate over which of these designations is more appropriate is presently settled. [...] Although it is a synonym of Spanish, it is preferable to reserve the term Castilian to refer to the Romance language arising in the Kingdom of Castile during the Middle Ages, or to the dialect of Spanish currently spoken in that region. [1]


Castellano o español, ambos son validos.


  1. wikipedia(en):Names given to the Spanish language