Earth Day

American  

[urth dey] / ˈɜrθ ˌdeɪ /

noun

1. 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

A single Martian day lasts about 40 minutes longer than an Earth day, and a Martian year stretches across 687 Earth days compared with 365 days on Earth.

From Science Daily

I am not just talking about obvious events like Thanksgiving, Christmas and the Fourth of July, but even lower-profile occasions like Flag Day or Earth Day, or celebrations that lay outside my ethnic group’s traditions, like Cinco de Mayo.

From The Wall Street Journal

Those two events helped spark the first Earth Day, in 1970, and the shutdown of America’s last whaling station in 1971.

From Los Angeles Times

The environmental group has been conducting habitat restoration in the reserve since 2019, with this weekend’s event also a late celebration of Earth Day, after a prior event was rained out.

From Los Angeles Times

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

From Slate