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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

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

“The bottom line is these people aren’t expecting Ronald Reagan to be some kind of miracle worker,” said Peter Hart in a Wall Street Journal front-page article the morning of Inauguration Day.

From The Wall Street Journal • Jan. 3, 2026

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

From Barron's • Dec. 19, 2025

As he has been doing since Inauguration Day.

From Los Angeles Times • May 29, 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