SPANISH AND CASTILIAN

Today I was listening to this actress married into the British Royal family, explain that she lived for a while in Argentina, where they speak a Spanish dialect called "castellano." That made me think of Alexander Pope ("A little learning is a dangerous thing") and prompted me to check "Castilian" in dictionaries. Random House explains: "1. The dialect of Spanish spoken in Castile. 2. The official standard form of the Spanish language as spoken in Spain, based on this dialect." Wrong on both counts. "Castellano", and "español" referring to the language, are interchangeable in the Spanish-speaking world. I prefer "castellano" because it is more neutral as it refers to a country long disappeared. Also because it is one of the 5 languages spoken in Spain.