CAVITY Meaning of CAVITY in English [cav.i.ty] n, pl -ties [MF cavite, fr. LL cavitas, fr. L cavus] (1541) 1: an unfilled space within a mass; esp: a hollowed-out space 2: an area of decay in a tooth: caries Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012