All 6 Uses

acknowledge
in
Incidents in the Life of a Slave Girl
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To my utter astonishment, he replied, "I don't believe it; but if she did acknowledge it, you tortured her into exposing me."†
Chpt 6

acknowledge = recognize
The girl to whom she said this had a mulatto child, of course not acknowledged by its father.†
Chpt 7 *

acknowledged = recognized
The poor black man who loved her would have been proud to acknowledge his helpless offspring.†
Chpt 7

acknowledge = recognize
She expressed her opinion very freely as to the respect Mr. Sands showed for his wife, and for his own character, in acknowledging those "young niggers."†
Chpt 27

acknowledging = recognizing
"But," said he, "it is a pitiable and degrading business, and I always felt ashamed to acknowledge my brother in connection with it."†
Chpt 30

acknowledge = recognize
She was grateful for the boon; but the idea of having been bought was always galling to a spirit that could never acknowledge itself to be a chattel.†
Chpt Appe

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.