What is Dyslexia? Revised Definition adopted by IDA October 22, 2025
https://dyslexiaida.org/definition-of-dyslexia/
(See also What is Structured Literacy?)
The Southern Region Branches of IDA (AL, FL, GA, LA, NC, SC, TN) hosted a free webinar on December 10 featuring Dr. Charley Haynes and Dr. Hugh Catts. Watch the recording to learn about the new definition of dyslexia and the reasoning behind the decisions.
Recording: The recording is housed on IDA Georgia’s YouTube Channel.
Slide Deck: The link to the most comprehensive version of the slides is on IDA’s website, below the definition: https://dyslexiaida.org/2025-dyslexia-definition-project/
Statement: EXPLANATION of IDA’s 2025 Updated Definition of Dyslexia
Other Resources Mentioned During the Webinar:
EdWeek Webinar: Bringing Dyslexia Screening into the Future
Snowling & Hulme (2025), Risk Factors for Dyslexia: Addressing Oral Language Deficits
Share (2025), Blueprint for a Universal Theory of Learning to Read: The Combinatorial Model
Dyslexia Defined: Unpacking the 2025 IDA Definition
Recording Available – EdWeb hosted Tim Odegard, Ph.D., Professor of Psychology and Chairholder, Chair of Dyslexic Studies, Middle Tennessee State University ( 1/28/2026)
Understanding the Revised Definition of Dyslexia
Dr. Odegard, Katherine Davis Murfree Chair of Excellence in Dyslexic Studies and Professor of Psychology at MTSU, has authored two new documents to help practitioners, parents, and policymakers unpack and understand the IDA’s 2025 revised definition of dyslexia. As a member of the Steering Committee, Dr. Odegard played an instrumental role in crafting the 2025 definition.
Tennessee Center for the Study and Treatment of Dyslexia, 2025
Infographic (at a glance)
Companion Guide (full)
IDA 2025 Definition of Dyslexia
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The International Dyslexia Association (IDA) is pleased to share the 2025 Dyslexia Definition, developed through a rigorous, collaborative process to reflect the latest research and the lived experiences of individuals with dyslexia. To explore the definition in greater depth, including the scientific and community-based foundations that informed its development, visit the 2025 IDA Definition Explanation below and view the October 23, 2025 IDA Definition Presentation (Slide Deck)
The Definition Explained: 2025 Dyslexia Definition Project
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