Earth Day

American

[urth dey] / ˈɜrθ ˌdeɪ /

noun

April 22, a day set aside globally for raising awareness about environmental issues and participating in events to help protect the environment.

Etymology

Origin of Earth Day

First recorded in 1970

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.

President Nixon presided over the first Earth Day, founded in large part as a reaction to a devastating oil spill off the coast of California.

From Los Angeles Times • Apr. 22, 2025

Just in time for National Parks Week and Earth Day, no less.

From Slate • Apr. 22, 2025

Though much has changed over the last five decades, this year’s Earth Day holds particular meaning in eco-conscious California.

From Los Angeles Times • Apr. 22, 2025

No wonder, then, that Americans planned nationwide Earth Day protests.

From Slate • Apr. 22, 2025

In the wake of the first Earth Day in 1970, a group named Keep America Beautiful, Inc., put up billboards that portrayed an actor in Indian dress quietly weeping over polluted land.

From "1491" by Charles C. Mann

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