Webster's English Dictionary

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navigation

nav.i.ga.tion \.nav-*-'ga--sh*n\ \-shn*l, -sh*n-*l\ \-e-\ n 1: the act or 
   practice of navigating  2: the science of getting ships or airplanes from 
   place to place; esp  : the method of determining position, course, and 
   distance traveled 3: ship traffic or commerce  - nav.i.ga.tion.al aj