Mr. Tulkinghorn being always correct and exact; still that does not," says Sir Leicester, "that does not lessen the anomaly, which is fraught with strange considerations—startling considerations, as it appears to me."
There are no more uses of "anomaly" in the book.
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We consider the accident an anomaly — not a reason to change standard procedures.
They rate a nuclear event from 1 (an anomaly) to 7 (a major accident).