The Collaborative International Dictionary of English v.0.48:

Collegiate \Col*le"gi*ate\, a. [L. collegiatus.]
   Of or pertaining to a college; as, collegiate studies; a
   collegiate society. --Johnson.
   [1913 Webster]

   Collegiate church.
   (a) A church which, although not a bishop's seat, resembles a
       cathedral in having a college, or chapter of canons (and,
       in the Church of England, a dean), as Westminster Abbey.
   (b) An association of churches, possessing common revenues
       and administered under the joint pastorate of several
       ministers; as, the Reformed (Dutch) Collegiate Church of
       New York.
       [1913 Webster]