The Collaborative International Dictionary of English v.0.48:

Notebook \Note"book`\, n.
   1. A book in which notes or memorandums are written.
      [1913 Webster]

   2. A book in which notes of hand are registered.
      [1913 Webster]

WordNet (r) 3.0 (2006):

notebook
    n 1: a book with blank pages for recording notes or memoranda
    2: a small compact portable computer [syn: notebook, notebook
       computer]

The Free On-line Dictionary of Computing (19 January 2023):

notebook

   1.  laptop computer.

   2.  Labtech Notebook.

   (1998-01-05)