imperfective vs serial

imperfective

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

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

serial

adj
  • Of or relating to a grammatical aspect relating to an action that is habitual and ongoing. 

  • Published or produced in installments. 

  • Having to do with or arranged in a series. 

  • Who performs a specified action or course of action repeatedly or regularly. 

verb
  • to assign a serial number to (especially of aircraft) 

noun
  • A work, such as a work of fiction, published in installments, often numbered and without a specified end. 

  • A unit of police officers equipped with shields to tackle a riot. 

  • A publication issued in successive parts, often numbered and with no predetermined end. 

  • A serial number, esp. one required to activate software. 

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