citation vs know

citation

noun
  • Enumeration; mention. 

  • The act of citing a passage from a text, or from another person, using the exact words of the original text or speech and giving credit to the original by referencing. 

  • A quotation with attached bibliographical details demonstrating the use of a particular lexical item in a dictionary, especially a dictionary on historical principles. 

  • An entry in a list of sources from which information was taken, typically following a prescribed bibliographical style; a reference. 

  • An official summons or notice given to a person to appear. 

  • A reference to decided cases, or books of authority, to prove a point in law. 

  • The passage or words quoted; a quotation. 

  • A commendation in recognition of some achievement, or a formal statement of an achievement. 

  • The paper containing such summons or notice. 

know

noun
  • Knowledge; the state of knowing; now confined to the fixed phrase ‘in the know’ 

  • Knowledge; the state of knowing. 

verb
  • To perceive the truth or factuality of; to be certain of or that. 

  • To experience. 

  • To understand or have a grasp of through experience or study. 

  • To be or become aware or cognizant. 

  • To be able to play or perform (a song or other piece of music). 

  • To be acquainted or familiar with; to have encountered. 

  • To be aware of; to be cognizant of. 

  • To recognize as the same (as someone or something previously encountered) after an absence or change. 

  • To have knowledge; to have information, be informed. 

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