HI/haɪ/nounThe word "hi" used as a greeting.“I didn't even get a hi.”Synonyms: greeting, hellointerjectionA friendly, informal, casual greeting said when meeting someone.“Hi, how are you?”An exclamation to call attention.Expressing wonder or derision.Synonyms: greetings, hello🔗 Explore synonyms & relationships🌍 See word origin & history