Usually means: Global celebration of environmental protection.
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We found 8 dictionaries that define the word Earth Day:

General (5 matching dictionaries)
  1. Earth Day: Merriam-Webster
  2. earth-day: Wordnik
  3. Earth Day, Earth day: Wiktionary
  4. Earth Day, Earth day: Wikipedia, the Free Encyclopedia
  5. Earth Day: Merriam-Webster

Computing (1 matching dictionary)
  1. Earth Day: Encyclopedia

Miscellaneous (1 matching dictionary)
  1. Earth Day: Holidays Around the World

Slang (1 matching dictionary)
  1. earth day: Urban Dictionary

Definitions from Wiktionary (Earth day)

noun:  (North American countries) April 22; Created in 1970, global day of observance of the need to protect the earth.
noun:  (obsolete, US) March 21st.
noun:  (science fiction) A day in Earth time; the period it takes planet Earth to revolve once; a period of 24 hours.

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