noun

• The act of congregating or collecting together.
• A gathering of faithful in a temple, church, synagogue, mosque or other place of worship. It can also refer to the people who are present at a devotional service in the building, particularly in contrast to the pastor, minister, imam, rabbi etc. and/or choir, who may be seated apart from the general congregation or lead the service (notably in responsory form).
• A Roman Congregation, a main department of the Vatican administration of the Catholic Church.
• A corporate body whose members gather for worship, or the members of such a body.
• Any large gathering of people.
• A flock of various birds, such as plovers or eagles.
• (UK, Oxford University) The main body of university staff, comprising academics, administrative staff, heads of colleges, etc.