“Adios!”

The answer to the crossword question is CIAO. The word “adios” and “ciao” are both informal ways of saying goodbye, but “ciao” is commonly used in Italian while “adios” is used in Spanish. So, the clue is indicating that “adios” and “ciao” have the same meaning, but the latter is the Italian equivalent. CIAO is a widely-recognized word, and it is often used globally as a more casual way of saying goodbye or hello. Therefore, the crossword answer for the question “‘Adios!’ is CIAO” provides a clear and concise explanation of the relationship between these two words.