What does aphasia mean?
Aphasia is a neurological condition in which a person loses or has impaired the ability to understand or express language — spoken, written, or signed — despite otherwise intact cognitive function. It is not a disease in itself but a symptom, almost always arising from injury to the brain's language centres, most commonly through stroke, traumatic brain injury, tumour, or a degenerative illness such as primary progressive aphasia. The severity varies widely: some individuals struggle only to recall specific words, while others may lose the capacity to speak or comprehend altogether. Clinicians distinguish subtypes such as Broca's aphasia, marked by laboured speech with preserved comprehension, and Wernicke's aphasia, where speech flows fluently but lacks meaning. Treatment relies on speech and language therapy, and many patients recover significant function, particularly after prompt rehabilitation. The term is formal and clinical, appearing mainly in medical writing and news coverage of health topics.
nounA medical condition characterized by the loss or impairment of the ability to understand or produce speech, typically caused by brain damage such as a stroke or head injury.
- The loss or impairment of the ability to comprehend or formulate spoken or written language, resulting from damage to the brain's language centres.
"After the stroke, she underwent months of therapy to cope with the aphasia that had stolen her ability to name everyday objects."
"Following the accident, the patient was diagnosed with severe expressive aphasia and could no longer form complete sentences."
"Primary progressive aphasia gradually eroded his vocabulary over several years, though his memory for faces remained intact."
Rarely used; the plural appears mainly in clinical or academic contexts when discussing multiple distinct types of the condition.
"The textbook surveys the various aphasias and their differing patterns of language breakdown."
Aphasia can rob a person of every spoken word while leaving their intelligence completely untouched — the mind stays sharp even as language slips away.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of aphasia
Aphasia derives from the Greek word 'phasis', meaning 'speech' or 'utterance', combined with the negative prefix 'a-', giving the literal sense 'without speech'. The term entered European medical usage in the mid-nineteenth century, when French physicians — notably Armand Trousseau — popularised it to describe language loss following brain damage. It shares its Greek root with words such as 'prophasis' and, more distantly, the family of English terms built on 'pathos', including 'empathy' and 'sympathy'.
Related word forms
How aphasia is actually used
Aphasia is a formal clinical term used in medicine, neurology, and speech pathology; it is rarely heard in casual conversation. Because it describes a condition rather than a personal failing, it carries a neutral-to-sympathetic connotation. In everyday British clinical practice, 'dysphasia' is sometimes preferred for milder cases.
Easily confused with aphasia
Aphasia refers to a more complete loss of language ability, whereas dysphasia denotes a partial impairment of it.