Definition of Progymnasium in US English:

Progymnasium

noun

  • In some European countries (chiefly parts of Germany and Switzerland): a school that prepares pupils for the gymnasium or upper school after primary school, sometimes incorporated within the gymnasium itself and regarded as its lower level; (also) a gymnasia not having the top forms which qualify for university entrance (now rare).

Origin

Mid 19th century; earliest use found in The Edinburgh Review. From German Progymnasium from pro- + Gymnasium.