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The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

Term:Intellectual disability
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Accession:HP:0001249 term browser browse the term
Definition:Subnormal intellectual functioning which originates during the developmental period. Intellectual disability, previously referred to as mental retardation, has been defined as an IQ score below 70.
Comment:This term should be used for children at least five years old. For younger children, consider the term Global developmental delay (HP:0001263).
Synonyms:exact_synonym: Mental deficiency;   Mental retardation;   Mental retardation, nonspecific;   Nonprogressive intellectual disability;   Nonprogressive mental retardation
 related_synonym: Dull intelligence;   Low intelligence;   Poor school performance
 alt_id: HP:0000730;   HP:0001267;   HP:0001286;   HP:0002122;   HP:0002192;   HP:0002316;   HP:0002382;   HP:0002386;   HP:0002402;   HP:0002458;   HP:0002482;   HP:0002499;   HP:0002543;   HP:0003767;   HP:0006833;   HP:0006877;   HP:0007154;   HP:0007176;   HP:0007180
 xref: MSH:D008607;   SNOMEDCT_US:228156007;   SNOMEDCT_US:247578003;   SNOMEDCT_US:91138005;   UMLS:C0025362;   UMLS:C0423903;   UMLS:C0917816;   UMLS:C1843367;   UMLS:C3714756;   UMLS:C4020876

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the nervous system 0
        Abnormal nervous system physiology 0
          Neurodevelopmental abnormality 0
            Intellectual disability 0
              Intellectual disability, borderline 0
              Intellectual disability, mild 0
              Intellectual disability, moderate 0
              Intellectual disability, profound 0
              Intellectual disability, progressive 0
              Intellectual disability, severe 0
paths to the root