The Collaborative International Dictionary of English v.0.48:

Burglary \Bur"gla*ry\, n.; pl. Burglaries. [Fr. Burglar; cf.
   LL. burglaria.] (Law)
   Breaking and entering the dwelling house of another, in the
   nighttime, with intent to commit a felony therein, whether
   the felonious purpose be accomplished or not. --Wharton.
   --Burrill.
   [1913 Webster]

   Note: By statute law in some of the United States, burglary
         includes the breaking with felonious intent into a
         house by day as well as by night, and into other
         buildings than dwelling houses. Various degrees of the
         crime are established.
         [1913 Webster]

WordNet (r) 3.0 (2006):

burglary
    n 1: entering a building unlawfully with intent to commit a
         felony or to steal valuable property