gymnasium

noun

Etymology: From Latin gymnasium, from Ancient Greek γυμνάσιον (gumnásion, “exercise, school”), from γυμνός (gumnós, “naked”), because Greek athletes trained naked.

1. A large room or building for indoor sports.
2. A type of secondary school in some European countries which typically prepares students for university.

   “Near-synonyms: grammar school, prep school”

3. A public place or building where Ancient Greek youths took exercise, with running and wrestling grounds, baths, and halls for conversation.