vacuity vs vacuum

vacuity

noun
  • Physical emptiness, an absence of matter; vacuum. 

  • Idleness; listlessness. 

  • Emptiness. 

  • An empty or inane remark or thing. 

vacuum

noun
  • An emptiness in life created by a loss of a person who was close, or of an occupation. 

  • The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, such as the condenser of a steam engine, which is nearly exhausted of air or steam, etc. 

  • A vacuum cleaner. 

  • An exercise in which one draws their abdomen towards the spine. 

  • A region of space that contains no matter. 

  • A spacetime having tensors of zero magnitude. 

verb
  • To optimise a database or database table by physically removing deleted tuples. 

  • To clean (something) with a vacuum cleaner. 

  • To use a vacuum cleaner. 

How often have the words vacuity and vacuum occurred in a corpus of books? (source: Google Ngram Viewer )