a book with blank pages for recording notes or memoranda
"I opened my empty notebook to write down the meeting details before they faded from memory."
a small compact portable computer
"After forgetting her laptop at home, she quickly pulled out her lightweight notebook to finish sending the emails before leaving for work."
A book in which notes or memoranda are written.
"She opened her notebook to jot down the phone number before it slipped her mind."
In plain English: A notebook is a book with blank pages used for writing down notes or ideas.
"He kept all his meeting ideas in a small notebook on his desk."
Usage: Use "notebook" to refer to a physical book with pages used for writing down reminders, ideas, or sketches. Do not use it interchangeably with digital applications like Notion or Evernote, which are specifically referred to as note-taking apps.
The word notebook is a straightforward combination of the words note and book. It was formed to describe a small book used specifically for writing down notes.