- The number four hundred and twenty, the integer between four hundred and ninteen and four hundred and twenty one.
So named because it is 420 centimetres long.
420 (plural 420s)
Unknown, although numerous theories abound; see Wikipedia; the most commonly-cited theory is that it originates from the time (4:20 pm) one particular group of smokers met.
- (slang, chiefly Canada, US) A phrase used to identify oneself with the consumption of cannabis, or cannabis culture.