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Inauguration Day

American

noun

the day on which the president of the United States is inaugurated, being January 20 of every year following a year whose number is divisible by four. Prior to the Twentieth Amendment to the Constitution (ratified February 6, 1933), it was March 4.

Inauguration Day British

noun

the day on which the inauguration of a president of the US takes place, Jan 20

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Inauguration Day

Since Inauguration Day 2025, the S&P 500 has risen by more than 13%, according to Dow Jones Market Data.

From MarketWatch ● Apr. 8, 2026

Kellogg had also shrugged off an appeal from television personality Tucker Carlson, who told him before Inauguration Day that Moscow was ready to start talking.

From The Wall Street Journal ● Dec. 20, 2025

Trump signed an executive order on Inauguration Day that kept the app running in the U.S.

From Barron's ● Dec. 19, 2025

At midday Wednesday, bitcoin has recovered by about 2.8%, but it is still appreciably lower than its price on Jan. 1 or on Inauguration Day.

From Los Angeles Times ● Nov. 28, 2025

Inauguration Day was bitingly cold, with temperatures never going above freezing and the wind making it feel more like fifteen degrees.

From "Becoming" by Michelle Obama

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023