inclined plane

noun
1.
one of the simple machines, a plane surface inclined to the horizon, or forming with a horizontal plane any angle but a right angle. Compare machine ( def 4b ).
2.
incline ( def 10a ).

Origin:
1700–10

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
inclined plane
 
n
a plane whose angle to the horizontal is less than a right angle

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
inclined plane   (ĭn'klīnd')  Pronunciation Key 
A plane surface, such as a ramp or a blade, set at an acute angle to a horizontal surface, a direction of motion, or a direction of force. Inclined planes are used to increase the distance over which work is done, reducing the amount of force needed to impart energy to a system. Rolling a car up a hill, for example, requires less force than lifting it straight up off the ground. Many tools, such as the ax, wedge, chisel, and highway ramp, exploit the mechanical properties of the inclined plane.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
He strives and strives to clamber up an inclined plane, and each time slips
  down.
First, skids of two logs were placed against the wall at an angle to serve as
  an inclined plane.
Potential energy can be brought into the act by applying the conservation of
  energy to a cylinder rolling down an inclined plane.
The inclined plane is a flat surface that is raised so one end is higher than
  the other.
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