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The_Saint said:
Baptists have conventions, Lutherans have synods. Do Presbyterians have any set term for differing sub groups?

As far as I know Presbyterian denominations such as the PCA are composed of regional groups called "Presbyteries"; when the national body meets as a whole that is called a "General Assembly".

Other Reformed groups such as the CRC use terms such as "Classis" which I think is roughly the same as a "Presbytery".

Theo