An aphasia is an impairment of cognitive abilities related to comprehending and producing language, and is attributed to neurological damage or disease. The term was introduced by the French physician Armand Trousseau in 1864.

Source:

Trousseau, A (1864). Del’aphasie, maladie d’erite recemment sous le nons impropre d’aphiimie. Gaz Hop Paris;37:13-14; 25-6; 37-9; 49-50