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A portable computer that is smaller than a notebook computer.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈsʌbˌnoʊt bʊk)
a laptop computer smaller and lighter than a notebook, typically weighing less than 5 pounds (2.3 kg).
[1990–95, Amer.]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
The Acer Aspire S3 laptop, a Windows ultraportable PC that costs $899.99, fulfills a promise the PC maker made this year to deliver a sub-$1,000 ultraportable to market.
Among the models in the redesigned Latitude line is the E4200, an ultraportable PC that is the smallest commercial notebook the company has ever made, at 12.1 inches across and weighing just 2.2 pounds.
OEMs are seeing greater demand for mobile broadband in tablets as well as ultraportable PCs. The plan could be foiled, however, if pricey mobile broadband service contracts deter potential buyers, adds Orr.