A person who advocates for or emphasizes the importance of convocations; one who supports the formal calling together of assemblies or councils.
From 'convocation' plus '-ist' (one who supports or practices). This appears to be a rare historical term, possibly from church or university contexts where convocations held political or ceremonial significance.
In medieval and early modern England, Convocationists were actual political figures who argued that church and university convocations held legitimate authority—it's a forgotten debate now, but it shaped English institutional history in ways we've forgotten.
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