The Collaborative International Dictionary of English v.0.48:

Circumnavigate \Cir`cum*nav"i*gate\, v. t. [imp. & p. p.
   Circumnavigated; p. pr. & vb. n. Circumnavigating.] [L.
   circumnavigatus, p. p. of circumnavigare to sail round;
   circum + navigare to navigate.]
   To sail completely round.
   [1913 Webster]

         Having circumnavigated the whole earth.  --T. Fuller.
   [1913 Webster]

WordNet (r) 3.0 (2006):

circumnavigate
    v 1: travel around, either by plane or ship; "We compassed the
         earth" [syn: circumnavigate, compass]