People who attend conventions, especially large gatherings of professionals or enthusiasts meeting to network, share ideas, and conduct business.
From 'convention' (Latin 'conventus', meeting) plus '-eer' (from French '-ier', indicating someone engaged in an activity), with '-s' for plural.
The word 'conventioneers' became popular in the early 1900s as conventions transformed American business—by the 1950s, Las Vegas was built largely to host them!
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