notebook

noun3

1. •
   a set of empty pages held inside a cover, where someone writes things down to keep them

   • With an unquenchable enthusiasm for locomotives and their work, at an early age I had commenced to keep engine and traffic-recording notebooks, compiled in a schoolboy's round hand. — 1946
2. •
   [before a noun] A kind of user interface in literate programming, allowing calculations to be interspersed with human-readable comments, diagrams, etc.
3. •
   Ellipsis of notebook computer (“laptop computer”).

   • Over time, the difference in size between laptops and notebooks became a matter of no more than an inch or two in length and width, and a fraction of an inch in thickness. — 2006