A communication disorder is a disease or condition that partially or totally prevents human communication. The defect can be in producing, receiving or understanding the communication.
Examples of communication disorders:
autism -- a developmental defect that affects understanding of emotional communication
aphasia -- loss of the ability to produce or comprehend language
... of Justinian, he was a Christian and possibly bishop of Croton. In approximately 580, he wrote "De origine actibusque Getarum[?]" (The origin and deeds of the Goths), "De ...