a powerful motor-driven vehicle with large, heavy treads, used for pulling farm machinery, other vehicles, etc.
Also called truck tractor. a short truck with a driver's cab but no body, designed for hauling a trailer or semitrailer.
something used for drawing or pulling.
a propeller mounted at the front of an airplane, thus exerting a pull.
Also called tractor airplane. an airplane with a propeller so mounted.

1855–60; < Latin trac-, variant stem of trahere to draw, pull + -tor -tor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tractor (ˈtræktə)
1.  a motor vehicle used to pull heavy loads, esp farm machinery such as a plough or harvester. It usually has two large rear wheels with deeply treaded tyres
2.  a short motor vehicle with a powerful engine and a driver's cab, used to pull a trailer, as in an articulated lorry
3.  an aircraft with its propeller or propellers mounted in front of the engine
[C18: from Late Latin: one who pulls, from trahere to drag]

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

1856, "something that pulls," earlier used of a quack device consisting of two metal rods which were supposed to relieve rheumatism (1798, in full Perkins's metallic tractor), from M.L. tractor, from stem of L. trahere "to pull, draw" (see tract (1)). Sense of "an engine or
vehicle for pulling wagons or plows" is first recorded 1901, from earlier traction engine (1859). The meaning "powerful truck for pulling a freight trailer" is first found 1926; tractor-trailer is attested from 1949.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Still other exiles enthusiastically hie themselves to potato bowls and farm
  festivals and tractor pulls.
It's not so long ago that almost everyone was still a farmer, and with a horse
  or mule instead of a tractor.
Then a tractor comes and pulls the bus out, while the all-kinds-of-people help.
If a tractor is coming your way the left side of your car is scratched by the
  hedgerow you narrowly avoid crashing into.
Images for tractor
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