colloquium vs symposium

colloquium

noun
  • An academic meeting or seminar usually led by a different lecturer and on a different topic at each meeting. 

  • An address to an academic meeting or seminar. 

  • A colloquy; a meeting for discussion. 

  • That part of the complaint or declaration in an action for defamation which shows that the words complained of were spoken concerning the plaintiff. 

symposium

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

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

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

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