Meaning of “hullo” - Learner’s Dictionary

hullo

exclamation UK (UK/US hello) uk us /həˈləʊ/
GREET

used to greet someone:

Hullo, Chris, how are things?
TELEPHONE

used to start a conversation on the telephone:

Hullo, this is Alex.

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