Intellectual Disability
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Intellectual disability is defined by significantly below-average intelligence, an IQ around 70 or below, combined with limitations in everyday adaptive skills. Both the score and real-world functioning must be considered, not the number alone.
IQ Glossary & Terms
IQ (Intelligence Quotient)
Deviation IQ
Ratio IQ
General Intelligence (g)
Fluid Intelligence (Gf)
Crystallized Intelligence (Gc)
Percentile
Standard Deviation (SD)
📅 Last updated: 2026-06-18 · ✔ Reviewed by the All-Lifes editorial team ·
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📚 Sources & references
IQ classification — Wikipedia
Mensa International — What is IQ?
APA Dictionary of Psychology — Intelligence
Raven's Progressive Matrices — Wikipedia
Cattell–Horn–Carroll theory — Wikipedia
Flynn effect — Wikipedia
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IQ Glossary & Terms