“atypical learner: A general term for a child who is different from the typical student in physical, intellectual, social, or emotional development, and who differs in mental characteristics, sensory abilities, communication abilities, or social behavior to the extent that special education services are required for that child to develop.”
Excerpted from: Turkington, Carol, and Joseph R. Harris, PhD. The Encyclopedia of Learning Disabilities. New York: Facts on File, 2006.