nonattendance n 1: the failure to attend [ant: {attendance}, {attending}]
Nonattendance \Non`at*tend"ance\, n. A failure to attend; omission of attendance; nonappearance. [1913 Webster]
30 Moby Thesaurus words for "nonattendance": 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, leave of absence, leaving, nonappearance, running away, sabbatical leave, sick leave, truancy, truantism, unexcused absence, vacation