Source : Webster's Revised Unabridged Dictionary (1913)

Godsend \God"send`\, n.
   Something sent by God; an unexpected acquisiton or piece of
   good fortune.

Source : WordNet®

godsend
     n : a sudden happening that brings good fortune (as a sudden
         opportunity to make money); "the demand for testing has
         created a boom for those unregulated laboratories where
         boxes of specimen jars are processed lik an assembly
         line" [syn: {boom}, {bonanza}, {gold rush}, {gravy}, {manna
         from heaven}, {windfall}, {bunce}]