People who display or show something to an audience, such as at a fair or museum.
From exhibit (Latin exhibere, 'to hold out, present') + -er (agent suffix) + -s (plural). The word evolved from the verb meaning to put something on display.
The spelling 'exhibiters' is actually less common than 'exhibitors'—English prefers the Latin-influenced '-or' ending for this particular word, showing how our language sometimes favors one agent noun form over another for historical reasons.
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