第
四
紀
第
四
紀
Definitions3 characters period/quaternary (geological covering 180,000 years)
Usage•••frequent
Pronunciations
第
四
紀
As word
1fourth period/quaternary (geological period covering the recent ice ages over the last 180,000 years)
2fourth period/quaternary (geological period covering the recent ice ages over the last 180,000 years)
3fourth period/quaternary (geological period covering the recent ice ages over the last 180,000 years)