My mom is out shopping, so my sister and I are house sitting.
I visited Koichi's house, but he was not there.
My husband is always away from home because of his business trips. I get very lonely so I call him at least five times a day.
You have gotten a mission. You must go out and detain a dangerous criminal to protect your country. While you go do that, you will be away from home and have an absence from society.
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.