conventioner

[ kuh n-ven-shuh-ner ]
/ kənˈvɛn ʃə nər /

noun

a conventioneer.
a member of a convention.

Origin of conventioner

First recorded in 1685–95; convention + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019