To account for this unprecedented apparition in aunt Pullet’s parlor, we must return to the moment when the three children went to play out of doors, and the small demons who had taken possession of Maggie’s soul at an early period of the day had returned in all the greater force after a temporary absence.
The circumstances were unprecedented in Mrs. Glegg’s experience; nothing of that kind had happened among the Dodsons before; but it was a case in which her hereditary rectitude and personal strength of character found a common channel along with her fundamental ideas of clanship, as they did in her lifelong regard to equity in money matters.
There are no more uses of "unprecedented" in the book.
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Human impact on the environment is increasing at an unprecedented rate.
The targeting of civilians is unprecedented in the conflict.