An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) Not in a certain place at a given time; away, missing (opposed to present).
2) Lacking; nonexistent (Dictionary.com).

M.E., from M.Fr. absent, from L. absentem (nominative absens), p.p. of abesse "to be away from," from → ab- "away" + esse "to be," → present.

Apâst, on the model of L. absentem, as above, from apâ- "away from," → apo-, + ast "is," → present.

A person who is absent, especially from work or school (Dictionary.com).

From → absent + -ee a suffix forming nouns that denote a person who is the object or beneficiary of the act specified by the verb, from Fr. -é, ending of p.p.s used as nouns.

Apâstgar, from apâst, → absent, + -gar, → -or.

Voluntary non attendance at work, without valid reason. Absenteeism means either habitual evasion of work, or willful absence as in a strike action. It does not include involuntary or occasional absence due to valid causes, or reasons beyond one's control, such as accidents or sickness (BusinessDictionary.com).

→ absent; → -ism.