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.
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         Having circumnavigated the whole earth.  --T. Fuller.
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