absence without leave vs absent

absence without leave

noun
  • The military offense of not being present when expected without proper authority. 

absent

noun
  • Something absent, especially absent people collectively; those who were or are not there. 

adj
  • Not existing; lacking. 

  • Being away from a place; withdrawn from a place; not present; missing. 

  • Inattentive to what is passing; absent-minded; preoccupied. 

verb
  • To keep (oneself) away. 

  • Leave. 

prep
  • In the absence of; without; except. 

How often have the words absence without leave and absent occurred in a corpus of books? (source: Google Ngram Viewer )