Jem said Mr. Avery misfigured, Dill said he must drink a gallon a day, and the ensuing contest to determine relative distances and respective prowess only made me feel left out again, as I was untalented in this area.
There are no more uses of "prowess" in the book.
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Their defensive prowess helped them win the Super Bowl.
They soon began to boast of their respective superiority to each other in strength and prowess.