convocation
noun /ˌkɒnvəˈkeɪʃn/
  /ˌkɑːnvəˈkeɪʃn/
(formal)- [countable] a large formal meeting, especially of Church officials or members of a university- the meeting of the university convocation in Oxford on 13 February 1845
 
- [uncountable] the act of calling together a convocation- the convocation of the second Vatican Council
 
- [countable] (North American English) a ceremony held in a university or college when students receive their degrees- I recently attended my friend's convocation ceremony.
 
Word Originlate Middle English: from Latin convocatio(n-), from the verb convocare, from con- ‘together’ + vocare ‘call’.