a portable microcomputer, usually battery-powered, small enough to rest on the user's lap and having a screen that closes over the keyboard like a lid. Compare tablet ( def 6 ).
Also called laptop computer.

1980–85; lap1 + top1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
laptop or laptop computer (ˈlæpˌtɒp)
Compare palmtop computer a personal computer that is small and light enough to be operated on the user's lap
laptop computer or laptop computer

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

as a type of portable computer, 1984, from lap (n.) + top (1) on model of desktop.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

laptop definition

A portable, compact personal computer that can run on a battery.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

laptop definition

portable computer

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
They'd been taught to interact with the robot, which was tethered to a laptop.
But once delivered to a site, it is almost as self-contained as any laptop.
The ability to manage your system from your laptop at home is seductive, but is
  not a realistic piece of risk-taking.
It takes five minutes to hook up the recorder to laptop and upload the file to
  one's website.
Image for laptop
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