different between proseminar vs proseminary

English

pro- (“earlier, rudimentary”) +? seminar

proseminar (plural proseminars)

A seminar that is open to (and accessible to) upper level undergraduates; contrasts with a graduate seminar (for graduate students only), which assumes more background.

pro- +? seminary?

proseminary (plural proseminaries)

A seminary that prepares pupils for a higher institution.
- 1774-1781, Thomas Warton, History of English Poetry
  It was then just founded as a proseminary for St. John's college Oxford

proseminary in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.

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