Definition of easternmost
: furthest to the east
… the northern tip of the island of Newfoundland, Canada's easternmost province.— Vanda Sendzimir No trip to Honolulu is complete without a drive to the easternmost point, Makapuu, about 30 minutes from Waikiki. — The New York Times
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Merriam-Webster unabridged
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Time Traveler for easternmost
The first known use of easternmost was circa 1631
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