Notebook (noun)

1. A small book of blank pages or blank pages interspersed with ruled lines, used for writing notes or memoranda.
2. A small, portable computer, typically having a thin LCD or LED computer screen mounted on the inside of the upper lid.

Origin:

From middle english noteboke, from old english notbōc, from notian "to note" + bōc "book".

Examples:

1. I keep all my notes in a notebook.
2. He took notes on a notebook during the meeting.
3. She always carries a notebook and pen with her, in case she needs to jot something down.
4. The notebook has a powerful processor and a large storage capacity.
5. The notebook has a touch screen and can be used as a tablet.