Did not hear "aji" mentioned in Spain. It appears that "aji" was originally an Arawak word.
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When Columbus arrived in the West Indies, he found at least two species of capsicums being cultivated by the Arawaks, agriculturists who had migrated north from their homeland in northeastern South America to the Caribbean Islands during a twelve-hundred-year period beginning about 1000 B.C.E. (Anghiera, 1964; Watts, 1987). Those migrants had traveled by way of present-day Trinidad and the lesser Antilles, bringing with them a tropical capsicum that had been domesticated in their homeland. They also brought the word "ají "—by which the plant was, and still is, known in the West Indies and throughout its native South American habitat (Heiser, 1969).
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Columbus believed that he had arrived in the Orient when he landed on the islands of the Caribbean Sea. He was so convinced of this that he called the islands the Indies, the natives were labeled Indians, and to the confusion of all who came after him, the pungent spice they ate was named pimiento after the completely unrelated black pepper—pimienta—that he sought. The indigenous Arawaks, his Indians, called the fruit axí (pronounced "aah hee") that was transliterated in Spanish to ají (ajé or agí).
Today the pungent varieties are still called ají in the Dominican Republic (formerly Española) and a few other places in the Caribbean and much of South America. In Spain American peppers are called pimiento or pimientón (depending on the size) after pimienta or black pepper from India.
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Found above info here and it has all anyone would ever want to know about chile (or chili).
http://www.answers.com/topic/chili-pepper-1 Trust you had at least one or two of these in Boston today: caribe; cascabel; cayenne; charleston hot; cherry pepper; chilaca; chipotle; fresno; guajillo; güero; habanero; hungarian wax; jalapeño; jamaican hot; mulato; pasilla; pepperoncini; pequín; pimiento; poblano; red pepper; ristra; santa fe grande; scotch bonnet; serrano; sweet peppers; thai chile; togarashi, or Hatch.
:hi: