No expense had been spared on the setting, which was acknowledged to be very beautiful even by people who shared his acquaintance with the Opera houses of Paris and Vienna.
Archer had been wont to smile at these annual vaticinations of his mother’s; but this year even he was obliged to acknowledge, as he listened to an enumeration of the changes, that the "trend" was visible.
There are no more uses of "acknowledge" in the book.
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She acknowledged that she might have forgotten.
It is important to acknowledge the work of others in one’s own writing.