[1] : WordNet (r) 2.0

leave of absence
     n : the period of time during which you are absent from work or
         duty; "a ten day's leave to visit his mother" syn: leave
see also:
leave 

[2] : Moby Thesaurus II by Grady Ward, 1.0

38 moby thesaurus words for "leave of absence":
   awol, french leave, abscondence, absence, absence without leave,
   absentation, absenteeism, absenting, cut, day off, default,
   departure, disappearance, escape, excused absence, fleeing,
   furlough, holiday, hooky, leave, leaving, liberty, nonappearance,
   nonattendance, paid holiday, paid vacation, running away,
   sabbatical, sabbatical leave, sabbatical year, shore leave,
   sick leave, time off, truancy, truantism, unexcused absence,
   vacation, weekend

Absence >> A Words
Absence, definition of term: Absence
absence_pag1.html

Leave >> L Words
Leave, definition of term: Leave
leave_pag1.html

Leave Out >> L Words
Leave Out, definition of term: Leave Out
leave+out_pag1.html

Leave Off >> L Words
Leave Off, definition of term: Leave Off
leave+off_pag1.html

Take Leave >> T Words
Take Leave, definition of term: Take Leave
take+leave_pag1.html

Shore Leave >> S Words
Shore Leave, definition of term: Shore Leave
shore+leave_pag1.html

On Leave >> O Words
On Leave, definition of term: On Leave
on+leave_pag1.html

French Leave >> F Words
French Leave, definition of term: French Leave
french+leave_pag1.html

Leave Of Absenc >> L Words
Leave Of Absenc, definition of term: Leave Of Absenc
leave+of+absenc_pag1.html

Ticket Of Leave >> T Words
Ticket Of Leave, definition of term: Ticket Of Leave
ticket+of+leave_pag1.html