'acataphasia' originates from Greek, specifically the word 'akataphasia,' where 'a-' meant 'not' and 'kataphasis' meant 'affirmation.'

'akataphasia' changed from the Greek word 'akataphasia' and eventually became the modern English word 'acataphasia'.

Initially, it meant 'lack of affirmation,' but over time it evolved into its current meaning of 'a speech disorder characterized by incoherent speech.'