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.