also: きがい
noun
Earth Boar
The 36th term of the traditional sexagenary cycle (干支), combining the Earth element with the Boar zodiac sign. Used in historical and astrological contexts, corresponding to years such as 1959, 2019, 2079.
See also: 干支
2019年は己亥の年にあたる。
The year 2019 corresponds to the Earth Boar year in the sexagenary cycle.
干支 is the general term for the sexagenary cycle or the Chinese zodiac system, while 己亥 is a specific term within that cycle.
Combination of the celestial stem 己 (Earth) and the terrestrial branch 亥 (Boar), forming the 36th term of the sexagenary cycle.