from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The number four hundred and twenty, the integer between four hundred and ninteen and four hundred and twenty one.
- n. A particular type of monohull dinghy with two sails, designed for two people.
- n. The consumption of cannabis, or cannabis itself.
So named because it is 420 centimetres long (Wiktionary)
Unknown, although numerous theories abound. (Wiktionary)