Meaning of “acknowledge” - Learner’s Dictionary

acknowledge

verb [ T ] uk us /əkˈnɒlɪdʒ/
ACCEPT

to accept that something is true or exists:

[ + (that) ] He acknowledged that there was a problem.
LETTER

to tell someone, usually in a letter, that you have received something they sent you:

Send a letter acknowledging receipt of his application.
SAY HELLO

to let someone know that you have seen them, usually by saying hello:

She didn't even acknowledge my presence.

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