A person who performs the task of accessioning; a museum or library professional who registers and catalogs new acquisitions.
From accession (verb) plus -er (agent suffix). This creates a noun for someone whose job is to formally acquire and record items.
An 'accessioner' is a behind-the-scenes museum worker who does the meticulous job of recording every new acquisition—they're the unsung heroes who make sure future generations can actually find and study the collection!
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