not in the place where you are expected to be, especially at school or work

John has been absent from school/work for three days now. 约翰到现在已经旷课／旷工三天了。

We drank a toast to absent friends. 我们为没能来的朋友举杯祝福。

not existing

Any sign of remorse was completely absent from her face. 她脸上没有一丝自责的神情。

used to describe a person or the expression on a person's face when they are thinking about other things and are not paying attention to what is happening near them

without

Absent a detailed plan, the project was doomed from the start. 由于缺乏详尽的规划，这项工程从一开始就注定要失败。

to not go to a place where you are expected to be, especially a school or place of work

You cannot choose to absent yourself (from work/school) on a whim. 你不能随意旷工／旷课。

With a brief apology, he absented himself from the table.

I took the opportunity to absent myself from the room.

She made a habit of absenting herself from the family.

The school is not responsible - these pupils chose to absent themselves.