plural captioners
Definition of captioner
: a person who writes captions
especially
: a person who provides the captions used in closed captioning
The captioner strokes the steno keys while listening to the live broadcast, transcribing the broadcast accurately while inserting correct punctuation and other symbols. — Ferguson's Careers In Focus, 2009
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Merriam-Webster unabridged
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Time Traveler for captioner
The first known use of captioner was in 1936
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