What does subnormal mean?
“Subnormal” is an adjective meaning below the normal or expected level. It can describe measurements, performance, growth, or other conditions that fall short of a standard. The word is especially associated with older medical and psychological terminology, in which it referred to intellectual or developmental functioning considered below the typical range. That usage is now widely regarded as demeaning because it reduced people to a supposedly inferior category, and it should generally be replaced by more precise and respectful language. In technical and scientific writing, the neutral sense remains useful: a voltage, temperature, or measured result may be described as subnormal when it is demonstrably below an expected range. The word is formally constructed from the prefix “sub-,” meaning below or under, and “normal.” Although related to the broader idea of abnormality, “subnormal” is more specific, emphasizing deficiency rather than any deviation from the norm.
adjectiveBelow the normal or expected level. In older medical and psychological usage, the term also referred to intellectual or developmental functioning considered below the typical range, but that use is now generally considered offensive.
- Below the normal or expected level.
- Of or relating to intellectual or developmental functioning considered below the typical range; now generally avoided as offensive.
"The sensor produced a subnormal reading, so the engineer checked the power supply."
"The device operated at a subnormal voltage until the faulty component was replaced."
"Her earlier medical records used a label that is now regarded as inappropriate and demeaning."
“Subnormal” points downward: it describes something below the expected range, not merely different from it.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does subnormal come from?
“Subnormal” combines the Latin-derived prefix sub-, meaning under or below, with normal, from Latin normalis, which derives from norma, meaning rule or standard. The resulting word entered English during the 19th century and was initially used in scientific and medical contexts. Its later association with classifications of human development and intelligence led to the decline of that sense in responsible usage.
Related word forms
How subnormal is actually used
The word is formal and relatively uncommon in general use. Its older medical and psychological use for describing people is now generally regarded as stigmatizing; use precise, respectful clinical language instead. In technical contexts, it may still be used neutrally for measurements below an expected range.
Easily confused with subnormal
“Abnormal” means deviating from what is normal in any way, whereas “subnormal” specifically means below an expected level.