(n.) The act of disappearing; cessation of appearance; removal from sight; vanishing.

AWOL French leave abscondence absence absence without leave absentation absenteeism absenting absquatulation bolt concealment cut day off decampment default departure desertion disappearing act elopement escape excused absence exit fleeing flight fugitation furlough hasty retreat hegira holiday hooky immateriality imperceptibility indiscernibility invisibility leave leave of absence leaving nonappearance nonattendance quick exit running away sabbatical leave scramming secrecy sick leave skedaddle skedaddling the invisible the unseen truancy truantism unexcused absence unperceivability unseeableness unsubstantiality vacation viewlessness