Godspeed

from WordNet (r) 3.0 (2006)

Godspeed
    n 1: a successful journey; "they wished him Godspeed"

from The Collaborative International Dictionary of English v.0.48

Godspeed \God"speed`\ (g[o^]d"sp[=e]d`), n.
   Success; prosperous journeying; -- a contraction of the
   phrase, "God speed you." [Written also as two separate
   words.]
   [1913 Webster]

         Receive him not into house, neither bid him God speed.
                                                  --2 John 10.
   [1913 Webster]