Truancy :  (noun)

1: failure to attend (especially school) [syn: hooky]

AWOL, French leave, abscondence, absence, absence without leave, absentation, absenteeism, absenting, clock-watching, cut, day off, default, departure, disappearance, dodging, ducking, escape, excused absence, fleeing, furlough, goofing off, holiday, hooky, leave, leave of absence, leaving, malingering, nonappearance, nonattendance, running away, sabbatical leave, shirking, sick leave, skulking, slacking, soldiering, tax dodging, tax evasion, truantism, unexcused absence, vacation, welshing,