Cellosaurus Disease Terminology Behavioral Disorder NICHD Terminology Neurological Development Terminology Intellectual Disability Intellectual Disability Cellosaurus Intellectual Disabilities NICHD Intellectual Disability A broad category of disorders characterized by an impairment to the intelligence an individual possesses. These impairments can result from trauma, birth, or disease and are not restricted to any particular age group. Mental or Behavioral Dysfunction C3276355 C97250