There is a micro-phenomenon of new wave, special snowflake directors that try to revolution the canons of classical opera. I saw Carmen being banged behind a burning car next to what looked like a flamenco-infused Thunderdome. That was in Paris opera, stronghold of modernist SJW nonsense.
Here, the expression is a shorter version of matriculation college. In a number of Canadian cities, many government-run secondary schools are called collegiates or collegiate institutes (C.I.), a complicated form of the word college which avoids the usual post-secondary connotation.
Definition of college for English Language Learners. : 1  a school in the U.S. that you go to after high school : a school that offers courses leading to a degree (such as a bachelor's degree or an associate's degree) : 2  a part of an American university that offers courses in a specified subject.