Sachem definitions

sā'chəm
A high official of the Tammany Society, a political organization in New York City.
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A chief of a Native American tribe or confederation, especially an Algonquian chief.
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A member of the ruling council of the Iroquois confederacy.
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Among some North American Indian tribes, the chief (of the tribe or of a confederation)
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Any of the leaders of the Tammany Society.
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A chief of a tribe of the American Natives; a sagamore.
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Origin of sachem

First attested in the 1620s. From Narragansett sachem; compare Unami sakima (“chief"), Mi'kmaq saqamaw (“chief"). Ultimately the same Proto-Algonquian root *sa·kima·wa as sagamore.