Meaning of “message” - Learner’s Dictionary

message

noun [ C ] us uk /ˈmesɪdʒ/
Did you pass on my message to him?He left an urgent message.Some girl phoned for you, but she didn't leave a message.You have two new messages.He posted the message on the noticeboard.
INFORMATION

A1 a piece of written or spoken information that one person gives to another:

Did you get / my message?
I left / her several messages, but she hasn't returned my call.
IDEA

B2 the most important idea of a film, book, etc:

The book conveys a complex message.

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