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.
an institution of higher learning, especially one providing a general or liberal arts education rather than technical or professional training. Compare university. 2. a constituent unit of a university, furnishing courses of instruction in the liberal arts and sciences, usually leading to a bachelor's degree. 3. an institution for vocational, technical, or professional instruction, as in medicine, pharmacy, agriculture, or music, often a part of a university.