It had been settled in the evening between the aunt and the niece, that such a striking civility as Miss Darcy’s in coming to see them on the very day of her arrival at Pemberley, for she had reached it only to a late breakfast, ought to be imitated, though it could not be equalled, by some exertion of politeness on their side; and, consequently, that it would be highly expedient to wait on her at Pemberley the following morning.
Lady Lucas began directly to calculate, with more interest than the matter had ever excited before, how many years longer Mr. Bennet was likely to live; and Sir William gave it as his decided opinion, that whenever Mr. Collins should be in possession of the Longbourn estate, it would be highly expedient that both he and his wife should make their appearance at St. James’s.
There are no more uses of "expedient" in the book.
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It was a necessary expedient to get the job done.
Until the new computer system is in place, e-mailing sensitive data will be a necessary expedient.