The definition of a congregation is a gathering of people, or people who share the same faith and habitually attend the same church.
(noun)All of the people who attend a particular church are an example of the church's congregation.
See congregation in Webster's New World College Dictionary
noun
Origin: ME congregacioun < OFr congregation or L congregatio, an assembling (in ML(Ec), religious community)
See congregation in American Heritage Dictionary 4
noun
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