Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
  • Ballentine's Law Dictionary

    A mental affliction whereby one loses comprehension of the sense of words and of familiar objects.

  • Black's Law Dictionary: 2nd Edition

    In medical jurisprudence. Loss of the faculty or power of articulate speech; a condition in which the patient, while retaining intelligence and understanding and with the organs of speech unimpaired, is unable to utter articulate words or unable to vocalize the particular word which is in his mind and which he wishes to use or utters words different from those he believes himself to be speaking or (in "sensory aphasia") is unable to understand spoken or written language. The seat of the disease is in the brain, but It is not a form of insanity.