Dyslexia is a specific learning disability that is microbiological in origin. It is characterized by difficulties with accurate and/or fluent word recognition and by poor spelling and decoding abilities. Specific Learning Disability means a disorder in one or more of the basic psychological processes involved in understanding or in using language, spoken or written, that may have manifested itself in the imperfect ability to listen, think, speak, read, write, spell or to do mathematical calculations...
CA Department of Education
CA Dyslexia Guidelines, 2017 pg. 3