Which term refers to the loss of ability to use or understand language due to a brain injury or disease?

The term used to describe the loss of the ability to use or understand language due to a brain injury or disease is dysphasia. Dysphasia can manifest in various ways, affecting a person's ability to speak, comprehend spoken language, or use written language. This condition can arise from factors such as stroke, traumatic brain injury, or degenerative diseases that impact language centers of the brain.

Dysnomia refers specifically to difficulty in recalling words, which is a more precise condition than the broader implications of dysphasia. Developmental dyspraxia involves difficulties in motor planning and coordination, often affecting speech production but is not primarily related to understanding or using language in the same way dysphasia is. An oral language disorder is a general term that can encompass a range of issues, but it doesn't specifically denote the loss of language ability due to brain injury or disease as dysphasia does. Thus, dysphasia specifically describes the condition of impaired language capabilities resulting from neurological factors, making it the most accurate terminology for this scenario.