Correct
甲子
/ jiǎzǐ /
Strokes
Definition
first year of the sixty-year cycle (where each year is numbered with one of the 10 heavenly stems 天干[tiān gān] and one of the 12 earthly branches 地支[dì zhī])/the sixty-year cycle
Example
As a Noun
sixty-year cycle (in traditional Chinese chronology)
As a Noun
first year in a sixty-year cycle