Mid 17th century; earliest use found in Henry Lord (b. 1563), clergyman and ethnographer. Either a variant of criminality, or independently from criminal + -ty.
Definition of criminalty in US English:
criminalty
nounˈkrɪmɪnlti
rare
Criminality.
Origin
Mid 17th century; earliest use found in Henry Lord (b. 1563), clergyman and ethnographer. Either a variant of criminality, or independently from criminal + -ty.