Hence, in the English, this thing of whaling good cheer is not normal and natural, but incidental and particular; and, therefore, must have some special origin, which is here pointed out, and will be still further elucidated.
There are no more uses of "incidental" in the book.
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Promise me—incidental to the issue—Anglo-Saxon—dirty word—Childe Roland.
Harper Lee -- Go Set a Watchman
Many of the professors used the Socratic method—direct, repetitive, and adversarial questioning—which had the incidental effect of humiliating unprepared students.