Definition of Pioneer Day
1
: July 24 observed as a legal holiday in Utah in commemoration of the arrival of Brigham Young on the present site of Salt Lake City in 1847
2
: June 15 formerly observed as a legal holiday in Idaho as the anniversary of the acceptance of the Oregon treaty by the president and the senate in 1846
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“Pioneer Day.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Pioneer%20Day. Accessed 18 Jun. 2021.
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