It was exactly the kind of pause—just a trifle rich with seniority of years—that had often tried the patience of both Franny and the vif tuoso at the other end of the phone when they were small children.
There are no more uses of "seniority" in the book.
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She has seniority, so she’s unlikely to be affected by the layoffs.
He wait until I confront them on it … then he wanna come crying seniority.