Madame Olenska, again with a hand at her hair, uttered an exclamation of assent—a flashing "Gia—gia"—and the Duke of St. Austrey entered, piloting a tremendous blackwigged and red-plumed lady in overflowing furs.
"Yes," she assented absently.
"Oh, eminently," Archer assented, pushing back the paper.
The statement was insignificant enough, and Archer was about to frame an assent when his words were checked by something mysterious yet illuminating in his visitor’s insistent gaze.
There are no more uses of "assent" in the book.
Show samples from other sources
She takes my silence as assent.
Sabaa Tahir -- An Ember in the Ashes
Their murmurs of assent and disapproval gave her a sense of order and rightness.