Noun
duodecade (plural duodecades)
A period of twelve years.
Each Chinese New Year during a "Jupiter return"—when a duodecade has passed and the Chinese zodiac animal of your birth year comes back around—it is expected that you find some red underwear to put on for the special occasion.
duodecade (plural duodecades)
(nonstandard) A period of two decades, a period of 20 years.