Absence
Nonattendance
noun, verbal noun
When a seat is lacking the person it's supposed to have in it, there is an absence. Where is Johnny? Another absence? Ugh. Johnny. C'mon.
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. Note that the けつ is shortened to けっ as つs often are when in a situation like this.
明日は欠席します。
I will be absent tomorrow.
昨日のミーティングの欠席者はゼロでした。
There were zero absences from yesterday's meeting.
コロナにかかってしまったので、卒業式は欠席しなくちゃいけませんでした。
I had to miss the graduation ceremony because I got COVID.