petition vs soliciting

petition

noun
  • A prayer; a supplication; an entreaty. 

  • A compilation of signatures built in order to exert moral authority in support of a specific cause. 

  • A formal written request for judicial action. 

  • A formal, written request made to an official person or organized body, often containing many signatures. 

verb
  • To make a request to, commonly in written form. 

soliciting

noun
  • The act of one who solicits. 

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