VACUITY Meaning of VACUITY in English [va.cu.i.ty] n, pl -ties [L vacuitas, fr. vacuus empty] (1541) 1: an empty space 2: the state, fact, or quality of being vacuous 3: something (as an idea) that is vacuous or inane Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012