Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline

Word Origin & History

autopilot

1935, from auto- + pilot (q.v.).

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica

Encyclopedia

autopilot

device for controlling an aircraft or other vehicle without constant human intervention.

Learn more about autopilot with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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People who can define Autopilot may know 35,117 words, as many as a 9th grader.

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automatic pilot

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"Good writing is always a breaking of the soil, clearing away prejudices, pulling up of sour weeds of crooked thinking, stripping the turf so as to get at what is fertile beneath. It would be amusing to carry the simile further. Those bulbs that flower in the sand and wither! The gay fiction annual that has to be planted again every year! Those experimental plants from Russia, France, and Greenwich Village that are always getting winter killed—confound 'em!—is it worth while planting them again? The stocky perennial that keeps coming up and coming up—so easy to grow and so ugly. Scarlet sage that gives a touch of fiery sin to the edge of the suburbanite's concrete walk! And then the good flowers—as honest as they are beautiful! The well-ordered gar den! The climbing rose that escapes and is the most beautiful of all!"

-Henry Seidel Canby

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autopilot

au·to·pi·lot