A member of a congregation; a person who regularly participates in a congregation, especially a religious assembly.
From 'congregation' plus the suffix '-er' (one who), an older English formation (16th-17th century) similar to 'congregant.'
This is another word for 'congregant' or 'congregation member'—it's more archaic but shows how English kept creating different names for the same role (congreganer, congregant, congregationist).
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