The Collaborative International Dictionary of English v.0.48:

Conflagration \Con`fla*gra"tion\, n. [L. conflagratio: cf. F.
   conflagration.]
   A fire extending to many objects, or over a large space; a
   general burning.
   [1913 Webster]

         Till one wide conflagration swallows all. --Pope.
   [1913 Webster]

WordNet (r) 3.0 (2006):

conflagration
    n 1: a very intense and uncontrolled fire [syn: conflagration,
         inferno]