420
Americannoun
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marijuana.
Are you carrying any 420 on you?
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marijuana drug use: The guys at the party were all 420-friendly.
Police presence at the concert discouraged 420.
The guys at the party were all 420-friendly.
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the twentieth day of the fourth month, or the time 4:20, when referenced as a day or time for cannabis consumption or the celebration of marijuana culture.
The head shop has a big pipe sale every year on 420.
Usage
What is 420? 420 is a slang term (or a kind of code word) referring to marijuana or marijuana use. Due to this association, 420 is also used as the name of an unofficial holiday that marijuana enthusiasts celebrate by using marijuana. It is sometimes called Weed Day (weed is a slang term for marijuana).
Etymology
Origin of 420
First recorded in 1970–75; a code word derived from the meeting time of a particular group of marijuana smokers in 1971, later popularized by fans of the band the Grateful Dead
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.
"From the satellite images, we've seen that nature sites which should be preserved have also been logged," she added, explaining that the size of the clear-cut area was comparable to 420 football fields.
From Barron's ● Oct. 4, 2026
In rural Holguín province, about 420 miles east of Havana, she visited Castro’s childhood home, a rambling wooden farmhouse that is now a national monument and museum.
From Los Angeles Times ● Oct. 1, 2026
That network contains 420 highly connected reactions, and many of the same compounds participate in multiple parts of the system.
From Science Daily ● Aug. 12, 2026
In Cornwall, Kernow Astronomers have stocked with 420 eclipse glasses to give out at their event at the National Trust car park at Carnewas, at the Bedruthan Steps near Newquay, on the county's north coast.
From BBC ● Aug. 11, 2026
Each one stood 420 feet tall, the equivalent of a thirty-story skyscraper, and had three whirring blades.
From "Killers of the Flower Moon" by David Grann
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
