A member of a congregation or religious assembly; a person who belongs to a congregational church or religious community.
Formed from 'congregation' plus the suffix '-ist' (one who practices or belongs to), created in English in the 16th-17th centuries to describe congregation members.
This word is extremely rare and archaic—most people would just say 'congregation member' or 'congregant' instead, but 'congreganist' shows how English created specific '-ist' words for people in religious groups.
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