Colorado Department of Education definition of “Twice Exceptional”
Twice-exceptional students are:
Students who are identified as gifted and talented in one or more areas of exceptionality (specific academics, general intellectual ability, creativity, leadership, visual, spatial, or performing arts);
And also identified with:
A disability defined by Federal/State eligibility criteria: perceptual communicative disability (learning disability), significant identifiable emotional disability, physical disabilities, sensory disabilities, autism, or ADHD.
The disability qualifies the student for an individual education plan (IEP) or a 504 Plan
http://www.cde.state.co.us/gt/download/pdf/TwiceExceptionalResourceHandbook.pdf