convocation

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act of convoking.
• noun A group of people convoked, especially the members of a college or university community who are assembled for a ceremony.
• noun A clerical assembly of the Anglican Church similar to a synod but assembling only when called.
• noun An assembly of the clergy and representative laity of a section of a diocese of the Episcopal Church.
• noun The district represented at such an assembly.

from The Century Dictionary.

• noun The act of calling together or assembling by summons.
• noun An assembly.
• noun [capitalized] An assembly of the clergy of the Church of England for the settlement of certain ecclesiastical affairs.
• noun In the University of Cambridge, England, an assembly of the senate out of term time.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of calling or assembling by summons.
• noun An assembly or meeting.
• noun (Ch. of Eng.) An assembly of the clergy, by their representatives, to consult on ecclesiastical affairs.
• noun (Oxf. University) An academical assembly, in which the business of the university is transacted.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The act of calling or assembling by summons.
• noun An assembly or meeting.
• noun An assembly of the clergy, by their representatives, to consult on ecclesiastical affairs.
• noun An academical assembly, in which the business of the university is transacted.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the act of convoking
• noun a group gathered in response to a summons