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tractor
A tractor is an engineering vehicle specifically designed to deliver a high tractive effort (or torque) at slow speeds, for the purposes of hauling a trailer or machinery used in agriculture or construction. Most commonly, the term is used to describe a farm vehicle that provides the power and traction to mechanize agricultural tasks, especially (and originally) tillage, but nowadays a great variety of tasks. Agricultural implements may be towed behind or mounted on the tractor, and the tractor may also provide a source of power if the implement is mechanised.
The word ''tractor'' was taken from Latin, being the agent noun of ''trahere'' "to pull".〔(Merriam-Webster Unabridged ) (MWU). (Online subscription-based reference service of Merriam-Webster, based on Webster's Third New International Dictionary, Unabridged. Merriam-Webster, 2002.) Headword ''tractor''. Accessed 2007-09-22.〕 The first recorded use of the word meaning "an engine or vehicle for pulling wagons or ploughs" occurred in 1901, displacing the earlier term "traction engine" (1859).
==National variations==
In the UK, the Republic of Ireland, Australia, India, Spain, Argentina, Slovenia, Serbia, Croatia, and Germany, the word "tractor" usually means "farm tractor", and the use of the word "tractor" to mean other types of vehicles is familiar to the vehicle trade, but unfamiliar to much of the general public. In Canada and the USA, the word may also refer to the road tractor portion of a tractor trailer truck, but also usually refers to the piece of farm equipment.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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