Meaning of “hello” - Learner’s Dictionary

hello

exclamation also UK hallo us uk /helˈəʊ/
Extra Examples
I said hello, but he didn't even look at me.Hello Andy, how are you?I'll just go and say hello to Ann.Oh, hello Jane, I didn't see you there.Hello there, how are you?
GREET

A1 used to greet someone:

Hello, Chris, how are things?
TELEPHONE

A1 used to start a conversation on the telephone:

Hello, this is Alex.

(Definition of “hello” from the Cambridge Learner’s Dictionary © Cambridge University Press)