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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

Example Sentences

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Inauguration Day

American investors were humming “Hail to the Chief” last January, with stocks up in the weeks before Inauguration Day.

From The Wall Street Journal ● Jan. 23, 2026

Yet U.S. equities staged a remarkable comeback following a massive dip in April, with the S&P 500 index up 16% since Inauguration Day.

From MarketWatch ● Jan. 17, 2026

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

From Barron's ● Dec. 19, 2025

I was just finishing writing my book on Inauguration Day and John Roberts swore Trump in, and the president swore an oath to uphold the Constitution, to faithfully execute it.

From Slate ● Dec. 1, 2025

As the sun began to set on Inauguration Day, the air temperature dropped further.

From "Becoming" by Michelle Obama

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