notebook

noun

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

noun

1. a book for recording notes or memoranda
2. a book for registering promissory notes

n.1570s, from note + book (n.).