1. A loss of the ability, previously possessed, to make or understand any sign or signal of communication, whether of organic or emotional origin: Asemias include the trainman's or switch-man's inability to realize the meaning of signals or colored lights, the student's lack of comprehension regarding letters, figures, and mathematical signs and symbols, and the soldier's disregard of bugle calls.
2. The inability to use or to understand signs, gestures, or written or printed language: This disorder of the loss of the ability to make or to understand any of the normal methods of communication is known as asemia which could be caused by a damaged part of the brain or a mental or an emotional problem rather than a physiological ailment.