- below the normal; less than or inferior to the normal: a subnormal amount of rain.
- being less than average in any psychological trait, as intelligence, personality, or emotional adjustment.
- a subnormal person.
- that part of the x-axis of a curve cut off between the ordinate and a normal.
- less than the normal
- having a low intelligence, esp having an IQ of less than 70
- a subnormal person
