A person or thing that fulfills; someone who completes a task, satisfies a need, or makes a promise come true.
From 'fulfill' (Old English 'fulfyllan,' meaning 'to fill full') with the agent suffix '-er,' literally meaning 'one who fills full' or 'one who completes.'
The word 'fulfiller' became ubiquitous with e-commerce and 'order fulfillment,' but it's actually an ancient concept—anyone keeping a promise has always been a 'fulfiller,' just with a newly scientific management jargon.
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