imperfective vs punctual

imperfective

noun
  • The imperfective aspect; a verb having this aspect. 

adj
  • Of, relating to or having the properties of the imperfective aspect. 

punctual

adj
  • Existing as a point or series of points 

  • Expressing momentary action that has no duration 

  • Acting at the appointed time 

  • Happening at the appointed time 

  • Periodic; occasional. 

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