nav ‧ i ‧ ga ‧ tion /ˌnævəˈɡeɪʃ ə n, ˌnævɪˈɡeɪʃ ə n/ BrE AmE noun [uncountable]
1 . the science or job of planning which way you need to go when you are travelling from one place to another:
compasses and other instruments of navigation
2 . when someone sails a ship along a river or other area of water:
Navigation becomes more difficult further up the river.
3 . when you ↑ click on words, pictures etc in order to move between documents that are connected on the Internet
—navigational adjective [only before noun]