Read the dictionary definition of absent. All definitions for this word.
1. go away or leave
1. He absented himself
2. lost in thought; showing preoccupation
1. an absent stare
2. an absentminded professor
3. the scatty glancing quality of a hyperactive but unfocused intelligence
3. nonexistent
1. the thumb is absent
2. her appetite was lacking
4. not being in a specified place