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Jet was originally used in English to mean "to protrude, stick out." This sense is best preserved in the related jetty1 "projecting pier," while the underlying meaning "to throw" is still present in the related jettison "throw something overboard." Jet began to be used for "to spurt out in a forceful stream" in the 17th century. The notion of using such a stream to create forward motion was first encapsulated in the term "jet propulsion" in the mid-19th century, but it did not take concrete form for nearly a hundred years (the term jet engine is not recorded until 1943). Other English words descended from Latin jacere "to throw," include abject, dejected, ejaculate, eject, inject, interject, jettison, jetty1, object, project, reject, subject, and trajectory.
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