“Dyslexia is an alternative term used to refer to a pattern of learning difficulties characterized by problems with accurate or fluent word recognition, poor decoding, and poor spelling abilities.”
Dr. Steven Dykstra
Diagnostic And Statistical Manual Of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR), 2013, p. 67
National Center for Improving Literacy
“A brain-based learning disability that specifically impairs a person's ability to read.”