1 [jet]
a stream of a liquid, gas, or small solid particles forcefully shooting forth from a nozzle, orifice, etc.
something that issues in such a stream, as water or gas.
a spout or nozzle for emitting liquid or gas: a gas jet.
verb (used without object), jetted, jetting.
to travel by jet plane: to jet to Las Vegas for the weekend.
to move or travel by means of jet propulsion: The octopus jetted away from danger.
to be shot forth in a stream.
to move or travel rapidly: The star halfback jetted toward the goal line.
verb (used with object), jetted, jetting.
to transport by jet plane: The nonstop service from New York will jet you to Tokyo in 13 hours.
to shoot (something) forth in a stream; spout.
to place (a pile or the like) by eroding the ground beneath it with a jet of water or of water and compressed air.
of, pertaining to, or associated with a jet, jet engine, or jet plane: jet pilot; jet exhaust.
in the form of or producing a jet or jet propulsion: jet nozzle.
by means of a jet airplane: a jet trip; jet transportation.

1580–90; 1940–45 for def 4; < Middle French jeter to throw < Vulgar Latin *jectāre, alteration of Latin jactāre, equivalent to jac- throw + -t- frequentative suffix + -āre infinitive suffix Unabridged


2 [jet]
a compact black coal, susceptible of a high polish, used for making beads, jewelry, buttons, etc.
a deep black.
Obsolete. black marble.
consisting or made of jet.
of the color jet; black as jet.

1350–1400; Middle English jet, get < Old French jaietLatin gagātēs < Greek (líthos) gagā́tēs Gagatic (stone), named after Gágai, town in Lycia; compare obsolete gagate, Middle English, Old English gagātes < Latin, as above Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
jet1 (dʒɛt)
1.  a thin stream of liquid or gas forced out of a small aperture or nozzle
2.  an outlet or nozzle for emitting such a stream
3.  a jet-propelled aircraft
4.  astronomy a long thin feature extending from an active galaxy and usually observed at radio wavelengths
vb , jets, jetting, jetted
5.  to issue or cause to issue in a jet: water jetted from the hose; he jetted them with water
6.  to transport or be transported by jet aircraft
[C16: from Old French jeter to throw, from Latin jactāre to toss about, frequentative of jacere to throw]

jet2 (dʒɛt)
a.  a hard black variety of coal that takes a brilliant polish and is used for jewellery, ornaments, etc
 b.  (as modifier): jet earrings
[C14: from Old French jaiet, from Latin gagātēs, from Greek lithos gagatēs stone of Gagai, a town in Lycia, Asia Minor]

JET (dʒɛt)
n acronym for
Joint European Torus; a tokamak plasma-containment device at Culham, Oxfordshire, for research into energy production by nuclear fusion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1420, "to prance, strut, swagger," from M.Fr. jeter "to throw, thrust," from L.L. jectare, abstracted from dejectare, projectare, etc., in place of L. jactare "toss about," freq. of jacere "to throw, cast," from PIE base *ye- "to do" (cf. Gk. iemi, ienai "to send, throw;" Hitt. ijami "I make"). Meaning
"to sprout or spurt forth" is from 1692. The noun sense of "stream of water" is from 1696; that of "spout or nozzle for emitting water, gas, fuel, etc." is from 1825. Hence jet propulsion (1867) and the noun meaning "airplane driven by jet propulsion" (1944, from jet engine, 1943). The first one to be in service was the Ger. Messerschmitt Me 262. Jet stream is from 1947. Jet set first attested 1951, slightly before jet commuter plane flights began.

"deep black lignite," 1351, from Anglo-Fr. geet, corresponding to O.Fr. jaiet (12c.), from L. gagates, from Gk. gagates lithos "stone of Gages," town and river in Lycia. As "a deep black color," attested from c.1450.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
jet   (jět)  Pronunciation Key 
  1. A rapid stream of liquid or gas forced through a small opening or nozzle under pressure.

  2. An aircraft or other vehicle propelled by one or more jet engines.

  3. A jet engine.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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