[Answer] "Sesquicentennial" refers to how many years?

Step 1 : Introduction to the question ""Sesquicentennial" refers to how many years?"

...An anniversary of an event that falls exactly 100 years since the day of the event is the centennial anniversary. When another hundred years goes by and the anniversary date rolls around again, the bicentennial anniversary celebrations are held. There's also a specific name for the anniversary that falls halfway between these two. A sesquicentennial celebration is one that relates to the one-hundred-and-fiftieth anniversary of a particular event. The first known use of the term to describe a 150-year anniversary was in 1880. Source: Merriam-Webster.com

Step 2 : Answer to the question ""Sesquicentennial" refers to how many years?"

150:

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