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English definition of “hello”

hello

exclamation, noun     /helˈəʊ/ US  /-ˈoʊ/ (UK also hallo, hullo)
A1 used when meeting or greeting someone: Hello, Paul. I haven't seen you for ages. I know her vaguely - we've exchanged hellos a few times. I just thought I'd call by and say hello. And a big hello (= welcome) to all the parents who've come to see the show.Welcoming, greeting and greetings A1 something that is said at the beginning of a phone conversation: "Hello, I'd like some information about your flights to the US, please."Welcoming, greeting and greetings something that is said to attract someone's attention: The front door was open so she walked inside and called out, "Hello! Is there anybody in?"Welcoming, greeting and greetings informal said to someone who has just said or done something stupid, especially something that shows they are not noticing what is happening: She asked me if I'd just arrived and I was like 'hello, I've been here for an hour.'InterjectionsSounds used as interjections old-fashioned an expression of surprise: Hello, this is very strange - I know that man.Meeting peopleOfficial meetings Grammar:Greetings and farewells: hello, goodbye, Happy New YearSee moreGrammar:Saying helloWhen we see someone we know, we usually exchange greetings:See moreGrammar:Saying goodbyeWhen we leave people, we usually say something as we leave:See more
(Definition of hello exclamationnoun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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