It seemed to Catherine that if she were his sister she would disprove this axiom.
It came to Catherine with the force—or rather with the vague impressiveness—of a logical axiom which it was not in her province to controvert; and yet, though it was a scientific truth, she felt wholly unable to accept it.
There are no more uses of "axiom" in the book.
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We prove with axioms. We do not prove axioms, so we have to agree on a place to start.
It is an axiom of governance that power, once acquired, is seldom freely relinquished.