Etymology So named because it is 420 centimetres long.
1
A particular type of monohull dinghy with two sails, designed for two people.
420
noun
Etymology Likely influenced by the time (4:20 pm) a particular group would meet in search of marijuana, circa 1971; subsequently spread as a cipher through the San Francisco Bay area and adopted among Grateful Dead fans.
Sunday is 420 day, when lovers of marijuana get together to celebrate their fondness for weed.2025 April 20, Sandee LaMotte, “Marijuana hospital visits linked to dementia diagnosis within 5 years, study finds”, in CNN:
2
Canada, US, Especially, Slang, Usually, As a modifier Pertaining to cannabis, its consumption, or cannabis culture.
Late nights at the recording studio were always 420 friendly.
3
Canada, US, Especially, Slang April 20 (abbreviated 4/20 in the US), as an occasion to celebrate cannabis culture.
420
noun
Etymology From section 420 of the Indian Penal Code (and its corresponding versions in modern Pakistan and Bangladesh), which criminalizes cheating.