1. [n]  a religious residence especially for nuns
2. [n]  a community of people in a religious order (especially nuns) living together

CONVENT is a 7 letter word that starts with C.

1. \Con"vent\, n. [L. conventus a meeting, LL. also, a
   convent. See {Convene}, v. i.]
   1. A coming together; a meeting. [Obs.]
   
            A usual ceremony at their [the witches] convents or
            meetings.                             --B. Jonson.
   
   2. An association or community of recluses devoted to a
      religious life; a body of monks or nuns.
   
            One of our convent, and his [the duke's] confessor.
                                                  --Shak.
   
   3. A house occupied by a community of religious recluses; a
      monastery or nunnery.
   
            One seldom finds in Italy a spot of ground more
            agreeable than ordinary that is not covered with a
            convent.                              --Addison.
   
   Syn: Nunnery; monastery; abbey. See {Cloister}.
   
   

2. \Con*vent"\, v. i. [L. conventus, p. p. of convenire.
   See {Convene}, v. i.]
   1. To meet together; to concur. [obs.] --Beau. & Fl.
   
   2. To be convenient; to serve. [Obs.]
   
            When that is known and golden time convents. --Shak.
   
   

3. \Con*vent"\, v. t.
   To call before a judge or judicature; to summon; to convene.
   [Obs.] --Shak.