duodecennial
adjUS /ˌduːoʊdɪˈsɛnɪəl/ · UK /ˌdjuːəʊdɪˈsɛnɪəl/
Etymology From Latin duodecennium (“12-year period”) + English -al (“forming adjs”), equivalent to borrowing the unattested duodecennialis.
1
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.
2
Occurring once a duodecade, occurring every 12 years.
- The concept of a duodecennial "Jupiter return" in Western astrology arose from similar concerns.