The Collaborative International Dictionary of English v.0.48:

Conventual \Con*ven"tu*al\ (?; 135), a. [LL. conventualis: cf.
   F. conventuel.]
   Of or pertaining to a convent; monastic. "A conventual garb."
   --Macaulay.
   [1913 Webster]

   Conventual church, a church attached or belonging to a
      convent or monastery. --Wordsworth.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Conventual \Con*ven"tu*al\, n.
   One who lives in a convent; a monk or nun; a recluse.
   --Addison.
   [1913 Webster]

WordNet (r) 3.0 (2006):

conventual
    adj 1: of communal life sequestered from the world under
           religious vows [syn: cloistered, cloistral,
           conventual, monastic, monastical]