convocation vs session

convocation

noun
  • An assembly or meeting. 

  • The act of calling or assembling by summons. 

  • An assembly of the clergy, by their representatives, to consult on ecclesiastical affairs. 

  • An academic assembly, in which the business of a university is transacted. 

  • A flock of eagles. 

session

noun
  • A meeting of a council, court, school, or legislative body to conduct its business. 

  • Any of the three scheduled two hour playing sessions, from the start of play to lunch, from lunch to tea and from tea to the close of play. 

  • A period devoted to a particular activity, e.g. the annual or semiannual periods of a legislative body (that together comprise the legislative term) whose individual meetings are also called sessions. 

  • The sequence of interactions between client and server, or between user and system; the period during which a user is logged in or connected. 

  • An extended period of drinking, typically consuming beer with low alcohol content. 

  • An academic term 

verb
  • To hold or participate in a jam session with other musicians. 

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