Definition of super-maximum in US English:

super-maximum

adjective

US
  • 1Greater than the expected or conventional maximum; extremely or exceptionally high, large, etc.

  • 2Designating a prison or part of a prison having super-maximum security measures, and intended for particularly dangerous prisoners.

Origin

Early 20th century. From super- + maximum.

Pronunciation

super-maximum

/ˌs(j)uːp(ə)rˈmaksɪməm/