1.
century
A period of 100 years.
二十一世紀に入った。
We entered the 21st century.
二十世紀は戦争の世紀だった。
The 20th century was a century of war.
世紀の大発見。
The discovery of the century.
世紀 refers to a 100-year period.
COUNTING CENTURIES:
- 一世紀 (1st century) / 1st century
- 二十/二十世紀 (20th century)
- 二十一世紀 (21st century)
COMMON EXPRESSIONS:
- 世紀の大発見 (discovery of the century)
- 世紀末 (end of a century)
- 中世 (Middle Ages) - related
NOTE ON READINGS:
When counting centuries, 二十世紀 (20th century) uses the reading にじゅっ for 20, with the っ before せ.