Etymology
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navigator (n.)

1580s, "one who navigates, one who directs the course of a ship," from Latin navigator "sailor," agent noun from navigat-, stem of navigare "to sail, sail over" (see navigation). Meaning "laborer employed in excavating a canal" is by 1775, from sense in inland navigation "communication by canals and rivers" (1727), later extended to those engaged in making railroads. In England, navigation was used in the sense of "an artificial waterway, or a part of a natural one that has been made navigable" by 1720.

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Definitions of navigator

navigator (n.)
the ship's officer in charge of navigation;
Synonyms: sailing master
navigator (n.)
the member of an aircrew who is responsible for the aircraft's course;
navigator (n.)
in earlier times, a person who explored by ship;
From wordnet.princeton.edu