Dyslexia is one of several distinct learning disabilities.

 

The word dyslexia is derived from the Greek dys, difficulty, and lex, having to do with words.  Based on information from neuroscientific and linguistic research, the definition can be summarized as difficulty in the use and processing of arbitrary linguistic/symbolic codes.  Persons with dyslexia are those who, despite traditional classroom teaching, have failed to master the basic elements of the language system of their culture.  Since language is the necessary tool upon which subsequent academic learning is based, such persons often encounter difficulty in all educational endeavors.*

 

*As defined by the Academy of Orton-Gillingham Practitioners and Educators.