arraign vs partial ordering relation

arraign

noun
  • Arraignment. 

verb
  • To officially charge someone in a court of law. 

  • To call to account, or accuse, before the bar of reason, taste, or any other tribunal. 

partial ordering relation

noun
  • A partial order. 

How often have the words arraign and partial ordering relation occurred in a corpus of books? (source: Google Ngram Viewer )