420

noun

A particular type of monohull dinghy with two sails, designed for two people.

“Late nights at the recording studio were always 420 friendly.”

Meanings

4201

noun420 (plural 420s)

plural 420s

  1. A particular type of monohull dinghy with two sails, designed for two people.

4202

noun420 (uncountable)

alternative 4:20 · alternative 4/20 · alternative four-twenty · alternative four twenty

  1. CanadaUSespeciallyslanguncountableCannabis.

    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. CanadaUSespeciallyslanguncountableusuallyPertaining to cannabis, its consumption, or cannabis culture.

    Late nights at the recording studio were always 420 friendly.

  3. CanadaUSespeciallyslanguncountableApril 20 (abbreviated 4/20 in the US), as an occasion to celebrate cannabis culture.

4203

noun420 (plural 420s)

plural 420s

  1. CanadaSouth AsiaUSespeciallyslangfraudster, cheater, forger; a smooth operator

Synonyms & antonyms

Origin

420 · noun

So named because it is 420 centimetres long.

Full word history & related roots →

420 · noun

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.

Full word history & related roots →

420 · noun

From section 420 of the Indian Penal Code (and its corresponding versions in modern Pakistan and Bangladesh), which criminalizes cheating.

Full word history & related roots →
Cite this entry
APA

420. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/420

MLA

“420.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/420. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “420,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/420.

Source: 420 on Wiktionary, CC BY-SA 4.0.