He brought out a notebook and pen from his pocket.
...her reporter's notebook.
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2.
A notebook computer is a small personal computer.
...a range of notebook computers which allows all your important information to travel safely with you.
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notebook
¦ noun
1. a small book for writing notes in.
2. a portable computer that is smaller than a laptop.
Wikipedia
Notebook
A notebook (also known as a notepad, writing pad, drawing pad, or legal pad) is a book or stack of paper pages that are often ruled and used for purposes such as note-taking, journaling or other writing, drawing, or scrapbooking.