All 4 Uses

acknowledge
in
The Giver
(Edited)

"Well, no, I guess not," Lily acknowledged reluctantly.
p. 22.4

acknowledged = admitted
"This is the time," she began, looking directly at them, "when we acknowledge differences."
p. 51.9

acknowledge = recognize or admit
The Committee of Elders stood and was acknowledged by applause.
p. 52.7

acknowledged = recognized
It was a small thing, the standing; but no one had ever stood automatically to acknowledge Jonas's presence before.
p. 73.3 *

acknowledge = express recognition of (showing respect)

Definitions:

(1) (acknowledge as in: acknowledge her or the truth)
express recognition or appreciation of someone or something; or to admit or express something
(2) (meaning too rare to warrant focus)
Specialized senses include sending an "acknowledgement" (letter or other message) to indicate that something was received and the "acknowledgements" section at the beginning of a book where an author recognizes and thanks other people who helped in creating the book or ideas contained in it.