deliberation vs symposium

deliberation

noun
  • The act of deliberating, or of weighing and examining the reasons for and against a choice or measure; careful consideration; mature reflection. 

  • Careful discussion and examination of the reasons for and against a measure 

symposium

noun
  • A collection of essays, articles or papers on a particular subject by a number of contributors. 

  • A drinking party in Ancient Greece, especially one with intellectual discussion. 

  • A conference or other meeting for discussion of a topic, especially one in which the participants make presentations. 

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