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1.
An extremely small, highly portable laptop used primarily for surfing the Internet.
I take my netbook to school instead of my laptop because it is smaller.
by whos-it whats-it November 10, 2008
 
2.
A small notebook computer designed to be ultra-portable. Extremely lightweight, power friendly, and also very affordable.

Netbooks, however, are usually very weak when it comes to computing power.
Him: Dude, I just got this netbook for 300 bucks!
Her: I hope you like running Linux on a 7-inch screen.
by pwn247 January 03, 2009
 
3.
A small inexpensive laptop lacking an optical drive and usually has a screen size of 10 -12 inches. Most of them have a cheap Intel Atom processor who's speed rivals that of a quadriplegic turtle. Usually used by college students as an inexpensive way to view pr0n.
Netbooks are only for small tasks like browsing the internet (as it's name implies.)
by unixmahboi December 15, 2010
 
4.
A small laptop made back in early 2000
The letters claim that the term netbook is trademarked by the firm that produced the Psion netBook in the early 2000’s.
by outlaw1984 January 16, 2009