Century
noun
The account of a generation... this covers a whole generation, and considering how long Japanese people live, this account totals a whole century.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
二十世紀
twentieth century
新世紀
new century
半世紀
half century
「今って何世紀だっけ？」「二十一世紀だよ。」
"What century is it right now?" "It's the 21st century."
コウイチは少なくとも一世紀は生きたいと思っている。
Koichi wants to live at least a century.
今世紀にはAIやロボットの進歩が注目されています。
Advances in artificial intelligence and robotics are being closely watched in this century.