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.
"What century is it right now?" "It's the 21st century."
Koichi wants to live at least a century.
I’m afraid my schedule is a little tight that day. I have several meetings related to a Japanese learning festival, which will be the largest one this century.