That, he had been the prisoner’s friend, but, at once in an auspicious and an evil hour detecting his infamy, had resolved to immolate the traitor he could no longer cherish in his bosom, on the sacred altar of his country.
There are no more uses of "auspicious" in the book.
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With good weather and no traffic, we had an auspicious start on our journey.
The fortune cookie said "Today is an auspicious day for romance."