Ciao/tʃaʊ/ Definition 1 of 2Pro Tip 1/3Casual Greeting Used among friends and casual acquaintances, not in formal situations. Ciao, Marco! How's it going? Pro Tip 2/3Informal Farewell Appropriate in casual goodbyes, avoid using it with superiors or in professional contexts. Ciao, let's catch up soon! Pro Tip 3/3Emotional Warmth Conveys friendliness and warmth, makes interactions more personal. Ciao Bella! You look radiant today!