From The Collaborative International Dictionary of English v.0.48 :
Circumnavigation \Cir`cum*nav`i*ga"tion\, n. The act of circumnavigating, or sailing round. --Arbuthnot. [1913 Webster]From WordNet (r) 3.0 (2006) :
circumnavigation n 1: traveling around something (by ship or plane); "Magellan's circumnavigation of the earth proved that it is a globe"