hel•lo /hɛˈloʊ, hə-, ˈhɛloʊ/ interj., n., pl. -los. interj. This word is used to express a greeting, answer a telephone, or attract attention: Hello, how are you? This word is used to express surprise, wonder, etc.: "Hello, what's this?'' said the detective. n. [countable] an act or instance of saying "hello''; greeting: a mumbled hello., 5 senses: 1. an expression of greeting used on meeting a person or at the start of a telephone call 2. a call used to attract. Click for more definitions., The meaning of hello. Definition of hello. English dictionary and integrated thesaurus for learners, writers, teachers, and students with advanced, intermediate, and beginner levels., Definition of hello exclamation in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more., "Helloo" is a slang term that has gained popularity in recent years. It is an extended version of the traditional greeting "hello," but with an added emphasis on the "o" sound. The term is often used to express enthusiasm, excitement, or surprise, and it can be used in a variety of contexts., HELLO meaning: 1 : used as a greeting; 2 : the act of saying the word hello to someone as a greeting.