Etymology
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intercept (n.)
"that which is intercepted," from intercept (v.). From 1821 of a ball thrown in a sport; 1880 in navigation; 1942 in reference to secret messages.
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aerobatics (n.)
"aircraft tricks, trick flying," 1914, from aero- + ending from acrobatics. Earlier (1879) it meant "the art of constructing and using airships; aerial navigation; aeronautics."
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bateau (n.)
"light, long boat for river navigation," 1711, from Canadian French bateau, from Old French batel, from Germanic *bait- "a boat" (see boat (n.)).
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nautical (adj.)

"pertaining to ships, sailors, or navigation," 1550s, from -al (1) + nautic from French nautique, from Latin nauticus "pertaining to ships or sailors," from Greek nautikos "seafaring, naval," from nautes "sailor," from naus "ship" (from PIE root *nau- "boat").

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aeronautics (n.)
1824, "art of aerial navigation by means of a balloon," from aeronautic (1784), from French aéronautique, from aéro- (see aero-) + nautique "of ships," from Latin nauticus, from Greek nautikos "pertaining to sailing" (see nautical). Originally of hot-air balloons. Also see -ics. Aeronaut "balloonist" is from 1784, from French aéronaute.
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octant (n.)

instrument for making angular measurements in navigation or astronomy, 1731, from Late Latin octans "the eighth part," from octo "eight" (see octa-) on analogy of quadrant. In geometry, "the eighth part of a circle," by 1750.

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aviation (n.)

"art or act of flying," 1866, from French aviation, noun of action from stem of Latin avis "bird" (from PIE root *awi- "bird"). Coined 1863 by French aviation pioneer Guillaume Joseph Gabriel de La Landelle (1812-1886) in "Aviation ou Navigation aérienne."

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Polaris (n.)

1769, short for stella polaris, Modern Latin, literally "the pole star" (see polar). The ancient Greeks called it Phoenice, "the Phoenician (star)," because the Phoenicians used it for navigation. Due to precession of the equinoxes the pole was a few degrees off (closer to Beta Ursae Minoris), but evidently Polaris was close enough. Also see pole (n.2). The Old English word for it was Scip-steorra "ship-star," also reflecting its importance in navigation. As the name of a U.S. Navy long-range submarine-launched guided nuclear missile, it dates from 1957.

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lodestar (n.)

late 14c. (late 13c. as a surname), "a star that leads or serves to guide," an old name for the pole star as the star that "leads the way" in navigation; from lode (n.) "a way, a course, something to be followed" (a Middle English variant spelling of load (n.) that preserved the original Old English sense of that noun) + star (n.). Figurative use from late 14c. Compare lodestone. Similar formation in Old Norse leiðarstjarna, German Leitstern, Danish ledestjerne.

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canal (n.)
early 15c., in anatomy, "tubular passage in the body through which fluids or solids pass;" mid-15c., "a pipe for liquid;" from French canal, chanel "water channel, tube, pipe, gutter" (12c.), from Latin canalis "water pipe, groove, channel," noun use of adjective from canna "reed" (see cane (n.)). Sense transferred by 1670s to "artificial waterway for irrigation or navigation."
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