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used in O Pioneers!

2 uses
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skillfulness in something
  • The space between his two front teeth, which were unusually far apart, gave him the proficiency in whistling for which he was distinguished at college.
    2.1 — Part 2 Chapter 1 (29% in)
  • Her training had all been toward the end of making her proficient in what she had undertaken to do.
    3.2 — Part 3 Chapter 2 (8% in)

There are no more uses of "proficiency" in O Pioneers!.

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