A person who collects or gathers items, money, or information; an older or alternative term for 'collector.'
From Latin 'colligere' (to gather) with agent suffix '-ioner' (one who does). This is an older or less common variant of the modern term 'collector,' used more commonly in historical texts.
You'll see 'collectioner' in old 18th-century documents describing tax collectors and debt collectors, but it's mostly fallen out of use in favor of the simpler 'collector'—language evolves to favor shorter words.
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