Meaning of “hello” - Learner’s Dictionary

hello

exclamation ( also UK hallo) uk us /helˈəʊ/
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)