inability to understand data presented to the senses
An obsolete term for the loss or impairment of understanding, especially speech comprehension. ... Origin: G. A-priv. + katamathesis, a thorough knowledge or understanding ... (05 Mar 2000) ... 
acatamathesia The perception (sensory) aspect of aphasia or dysphasia (any disturbance in the comprehension or expression of languages due to a brain lesion).