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Meaning of closed-captioned

closed-cap•tioned

Pronunciation: (klōzd'kap'shund), [key]
— adj.
  1. (of a television program) broadcast with captions, as for the hearing-impaired, that are visible only with the use of a decoder attached to the television set.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.