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Oxford dictionary definition of the word Onondaga:
noun (plural same or Onondagas)
1a member of an Iroquois people, one of the five comprising the original Iroquois confederacy, formerly inhabiting an area near Syracuse, New York.
2 [mass noun] the extinct Iroquoian language of the Onondaga.
relating to the Onondaga or their language.
from the Iroquoian name of their main settlement, literally ‘on the hill’