earth day

Main Entry:  Earth Day
Part of Speech:  n
Definition:  a day's observance of the need to protect the Earth's environment, in many countries on April 22
Example:  The first Earth Day was organized in 1970 to promote the ideas of ecology, encourage respect for life on earth, and highlight growing concern over pollution of the soil, air, and water.
Etymology:  1969's 21st Century Lexicon
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Word Origin & History

Earth Day
as an ecological awareness event on April 22, dates to 1970; the idea and the name formed in 1969.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica

earth day

annual celebration honouring the achievements of the environmental movement and raising awareness of the importance of long-term ecological sustainability. Earth Day is celebrated in the United States on April 22; throughout the rest of the world it is celebrated on either April 22 or the day the vernal equinox occurs.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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