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English definition of “hello”

hello

exclamation, noun [C]  /heˈloʊ, hə-/ (plural hellos) us  
used when meeting or greeting someone: "Hello, Paul," she said, "I haven’t seen you for months." I know her vaguely – we’ve exchanged hellos a few times. Come and say hello to my friends (= meet them). Hello is also said at the beginning of a telephone conversation. Hello is also used to attract someone’s attention: She walked into the shop and called out, "Hello! Is anybody here?"
(Definition of hello from the Cambridge Academic Content Dictionary © Cambridge University Press)
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