(n.) The quality or state of being accustomed.

Attic simplicity accustomedness averageness banality banalness baseness chasteness classical purity cliche coarseness common occurrence commonality commonplaceness confirmedness conventionality corniness currency customariness dullness extensiveness familiarness fixedness flatness fourth-rateness frequence frequency fustiness garden variety generality habitualness hackneyedness homeliness humbleness ignobility incidence inferiority inferiorness insipidness inveteracy inveterateness lowliness lowness matter-of-factness meanness mustiness normality oftenness ordinariness plainness platitudinousness plebeianism poorness prevalence prosaicism prosaicness prosaism prosiness purity rampantness reign relative incidence rifeness routineness run second-rateness settledness simpleness simplicity squareness staleness standardness sweepingness third-rateness triteness unembellishedness unexceptionality unidealism unimaginativeness unnoteworthiness unoriginality unpoeticalness unremarkableness unromanticism usualness vapidity widespreadness wontedness