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ascertain
used in Treasure Island

only 1 use
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Definition
find out, learn, or determine with certainty (usually by making an effort)
  • I was to go down the sandy spit that divides the anchorage on the east from the open sea, find the white rock I had observed last evening, and ascertain whether it was there or not that Ben Gunn had hidden his boat, a thing quite worth doing, as I still believe.
    Chapter 22 — How My Sea Adventure Began (38% in)

There are no more uses of "ascertain" in Treasure Island.

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