Pronunciation: (nōt'book"),[key] —n. 1. a book of or for notes.
2. a book or binder of blank, often ruled, pages for recording notes, esp. one used by students in class.
3. a book in which promissory notes are entered, registered, recorded, etc.
4. a small, lightweight laptop computer measuring approximately 8 1/2 × 11 in. (22 × 28 cm).