a book of or for notes.
a book or binder of blank, often ruled, pages for recording notes, especially one used by students in class.
a book in which promissory notes are entered, registered, recorded, etc.
a small, lightweight laptop computer.

1570–80; note + book Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
notebook (ˈnəʊtˌbʊk)
1.  a book for recording notes or memoranda
2.  a book for registering promissory notes

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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Computing Dictionary

notebook definition

1. laptop computer.
2. Labtech Notebook.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Each notebook spans about four months, transcending minutiae to record the life
  of our times as well as her own.
He wrote down in a notebook the names of the best pool shooters in the world,
  and proceeded to beat them one by one.
Sales of cheaper notebook computers are already suffering.
When you find a box, open the notebook you find inside.
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