a place along a road, border, etc., where travelers are stopped for inspection.
a point or item, especially in a procedure, for notation, inspection, or confirmation.

1935–40; check1 + point Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
checkpoint (ˈtʃɛkˌpɔɪnt)
a place, as at a frontier or in a motor rally, where vehicles or travellers are stopped for official identification, inspection, etc

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

1940, from check + point. Originally an aviator's term for landforms or structures of known height against which the craft's altitude could be visually checked. The "vehicle stop" sense is recorded from 1950.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

checkpoint definition

Saving the current state of a program and its data, including intermediate results, to disk or other non-volatile storage, so that if interrupted the program could be restarted at the point at which the last checkpoint occurred.
This facility came into popular use in mainframe operating systemss such as OS/360 in which programs frequently ran for longer than the mean time between system failures. If a program run fails because of some event beyond the program's control (e.g. hardware or operating system failure) then the processor time invested before the checkpoint will not have been wasted.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Once through the checkpoint, the malignant cells can enter the blood stream and
  then can spread throughout the body.
Gauntlets would be costly, since the airlines would have to install several new
  expensive machines at each checkpoint.
He tutors me on how to display the badge and my driver's license for checkpoint
At one checkpoint, the secret police tried to arrest my local interpreter.
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