DUODECENNIAL + NOUN
chinese, jupiter, zodiac
PREP.
in
adj
Consisting of twelve years, occurring in 12-year cycles.
The duodecennial Chinese zodiac originated from Chinese and Indian observations of the duodecennial cycle of the Jovian orbit.
Occurring once a duodecade, occurring every 12 years.
The concept of a duodecennial "Jupiter return" in Western astrology arose from similar concerns.